Cyrene/docs/api/gateway-api.md

# Cyrene Gateway API 文档

**版本:** v1 | **Base URL:** `http://<gateway-host>:<port>/api/v1`

所有需要认证的接口在 HTTP Header 中携带 JWT：
```
Authorization: Bearer <jwt_token>
```

WebSocket 通过 query 参数传 token：`/ws/chat?token=<jwt_token>`

---

## 目录

1. [认证](#1-认证)
2. [WebSocket 实时通信](#2-websocket-实时通信)
3. [会话管理](#3-会话管理)
4. [消息搜索](#4-消息搜索)
5. [语音 STT / TTS](#5-语音-stt--tts)
6. [文件管理](#6-文件管理)
7. [图片分析](#7-图片分析)
8. [知识库](#8-知识库)
9. [记忆管理](#9-记忆管理)
10. [自动化规则与场景](#10-自动化规则与场景)
11. [通知推送](#11-通知推送)
12. [提醒管理](#12-提醒管理)
13. [每日简报](#13-每日简报)
14. [Webhook 第三方接入](#14-webhook-第三方接入)
15. [Admin 管理](#15-admin-管理)
16. [健康检查](#16-健康检查)

---

## 1. 认证

### POST /auth/register — 注册

Auth: 无。IP 限流 ~5/min。仅 `REGISTRATION_ENABLED=true` 时可用（默认关闭）。

```json
// 请求
{
  "username": "string (3-32 chars, ^[a-zA-Z0-9_]+$)",
  "password": "string (6-64 chars)",
  "email": "string (需含 @)",
  "nickname": "string (1-32 chars)",
  "verify_code": "string (6 chars, 开发阶段固定 000000)"
}

// 响应 201
{
  "user_id": "user_<username>",
  "token": "JWT",
  "refresh_token": "JWT (30天)",
  "expires": 1717000000,
  "nickname": "string"
}
```

错误: 400 `用户名格式无效`, 400 `邮箱格式无效`, 400 `验证码错误`, 403 `当前不开放公开注册`, 409 `用户名已被注册`

---

### POST /auth/login — 登录

Auth: 无。IP 限流 ~5/min。

```json
// 请求
{
  "username": "string",
  "password": "string"
}

// 响应 200
{
  "user_id": "admin",
  "nickname": "string",
  "token": "JWT",
  "refresh_token": "JWT (30天)",
  "expires": 1717000000
}
```

错误: 400 `用户名格式无效`, 401 `用户名或密码错误`

---

### POST /auth/refresh — 刷新 Token

Auth: JWT（可接受已过期的 token，或在 body 中提供 refresh_token）。

```json
// 请求（可选）
{ "refresh_token": "string" }

// 响应 200
{
  "token": "新 JWT",
  "refresh_token": "新 JWT (30天)",
  "expires": 1717000000
}
```

错误: 401 `刷新令牌无效或已过期`, 401 `未提供认证令牌`

---

## 2. WebSocket 实时通信

### GET /ws/chat — 建立连接

```
ws://<gateway>/ws/chat?token=<jwt>&session_id=<optional>&client_id=<optional>&device_name=<optional>
```

| Query 参数 | 必填 | 说明 |
|-----------|------|------|
| `token` | 是* | JWT（也可用 `Authorization: Bearer` header） |
| `session_id` | 否 | 不传自动生成 `session_` + 12 随机字符 |
| `client_id` | 否 | 多端标识 |
| `device_name` | 否 | 设备名 |

注意：WebSocket 仅限 admin 用户；非 admin 收到 **403**。

---

### 客户端 → 服务端 (ClientMessage)

```json
{
  "type": "message|voice_input|ping|history",
  "session_id": "string (可选)",
  "mode": "text|voice_msg|voice_assistant",
  "content": "string (message 类型必填)",
  "audio_data": "string (voice_input 类型必填, base64)",
  "attachments": [
    {
      "type": "image",
      "url": "string",
      "thumbnail_url": "string",
      "filename": "string",
      "width": 0,
      "height": 0,
      "size": 0,
      "description": "string"
    }
  ],
  "timestamp": 1717000000000,
  "client_id": "string",
  "device_name": "string",
  "user_agent": "string"
}
```

| type | 说明 |
|------|------|
| `message` | 文字聊天，触发 AI 回复 |
| `voice_input` | 语音输入，先转录再作为 message 处理 |
| `ping` | 心跳，自动回复 pong |
| `history` | 请求历史消息 |

---

### 服务端 → 客户端 (ServerMessage)

```json
{
  "type": "string (见下表)",
  "message_id": "string",
  "text": "string (完整文本)",
  "content": "string (增量文本/完整内容)",
  "role": "user|assistant|action|system",
  "msg_type": "chat|action|thinking|tool_progress|system_info",
  "session_id": "string",
  "error": "string (仅错误时)",
  "timestamp": 1717000000000,
  "segments": [ { "index": 0, "text": "string", "audio_url": "string", "duration_ms": 0 } ],
  "messages": [ Message ],
  "thinking_status": "string",
  "thinking_content": "string",
  "tool_progress": { "tool_name": "string", "status": "started|running|completed|failed", "progress": 0.5, "message": "string" },
  "system_info": { "level": "info|warning|error", "message": "string", "action": "string" },
  "notification": { "id": "string", "type": "info|warning|success|thinking|reminder", "title": "string", "body": "string", "timestamp": "string", "data": {} },
  "multi_message": { "messages": [ { "index": 0, "content": "string" } ] },
  "review_messages": [ { "type": "action|chat", "content": "string", "delay_ms": 0 } ],
  "client_info": { "client_id": "string", "device_name": "string", "user_agent": "string" },
  "full_audio_url": "string",
  "response_mode": "string"
}
```

### ServerMessage type 列表

| type | 说明 |
|------|------|
| `response` | 完整文本回复 |
| `stream_start` | AI 开始生成 |
| `stream_chunk` | 增量文本块 |
| `stream_end` | AI 生成结束（含完整 text） |
| `stream_segments` | 流式断句（语音） |
| `voice_transcript` | 语音转录结果 |
| `error` | 错误 |
| `history_response` | 历史消息返回 |
| `notification` | 推送通知 |
| `multi_message` | 多条消息合并投递 |
| `review` | 审查后结构化消息 |
| `thinking` | 后台思考更新 |
| `tool_progress` | 工具执行进度 |
| `system_info` | 系统级通知 |
| `pong` | 响应 ping |
| `device_update` | IoT 设备状态更新 |
| `background_thinking` | 后台思考状态变更 |

---

### 流式响应流程

```
Client                    Gateway                    AI-Core
  |                          |                          |
  |-- {type:"message"} -->   |                          |
  |                          |-- POST /api/v1/chat -->  |
  |                          |   (SSE streaming)        |
  |                          |<-- data: {delta:"..."}   |
  |<-- {type:"stream_start"} |                          |
  |<-- {type:"review"}       | (多条结构化消息)           |
  |<-- {type:"stream_segments"} | (断句事件)             |
  |<-- {type:"stream_end"}   | (含 full text)           |
```

---

### 语音输入流程

```
Client                           Gateway                       Voice-Service
  |                                 |                               |
  |-- {type:"voice_input",         |                               |
  |    audio_data:"<base64>"} -->   |                               |
  |                                 |-- POST /transcribe -->        |
  |                                 |<-- {text:"..."}              |
  |<-- {type:"voice_transcript",   |                               |
  |     text:"转录结果"}            |                               |
  |                                 |                               |
  |   (Gateway 自动将转录文本       |                               |
  |    作为 message 发给 AI-Core)    |                               |
  |<-- {type:"stream_start"}       |                               |
  |<-- ... 正常流式回复 ...         |                               |
```

---

## 3. 会话管理

所有接口需要 JWT。Admin 可操作所有用户；非 admin 仅限自己的数据。

### POST /sessions — 创建会话

```json
// 请求 (全部可选，空 body 也可)
{
  "session_id": "string (可选，不传自动生成)",
  "title": "string (默认 '新的对话')",
  "is_main": false
}

// 响应 201
{
  "id": "string",
  "user_id": "string",
  "title": "string",
  "is_main": false,
  "created_at": 1717000000000,
  "updated_at": 1717000000000
}
```

### GET /sessions — 列表

`?user_id=xxx` — admin 可查任意用户；非 admin 只能查自己。

```json
// 响应 200
{ "sessions": [ Session, ... ] }
```

### GET /sessions/:id — 详情

同 Session 结构。

错误: 404 `{"error":"会话不存在","errorType":"session_not_found","hint":"该会话可能已被删除或尚未创建"}`

### DELETE /sessions/:id — 删除

`{"status":"deleted"}`

### DELETE /sessions — 清空全部

`?user_id=xxx` → `{"status":"deleted"}`

### GET /sessions/:id/messages — 消息

`?limit=50&offset=0`

```json
// 响应 200
{
  "messages": [
    {
      "id": 1,
      "session_id": "string",
      "role": "user|assistant|system|action",
      "msg_type": "chat|action",
      "content": "string",
      "created_at": 1717000000000
    }
  ]
}
```

### DELETE /sessions/:id/messages — 清空服务器本地所有消息

`{"status":"cleared"}`

### GET /sessions/:id/export — 导出

`?format=json|markdown|txt（默认 json）`

返回文件下载。JSON 导出格式：
```json
{
  "session": { "id", "title", "created_at", "updated_at" },
  "messages": [ { "role", "content", "created_at" } ]
}
```

---

## 4. 消息搜索

### GET /messages/search — 全文搜索

`?q=<keyword>&user_id=xxx&limit=50&offset=0`

```json
// 响应 200
{
  "results": [
    {
      "message_id": "string",
      "session_id": "string",
      "session_title": "string",
      "role": "string",
      "content": "string",
      "created_at": 1717000000000
    }
  ],
  "total": 10,
  "query": "keyword",
  "limit": 50,
  "offset": 0
}
```

---

## 5. 语音 STT / TTS

### POST /voice/transcribe — 语音转文字

Content-Type: `multipart/form-data`。字段 `audio` (file)。最大 10MB。接受 PCM/WAV/MP3/OGG/FLAC/WebM 等格式。

```json
// 响应 200
{ "success": true, "text": "识别结果文本" }

// 错误
{ "success": false, "error": "语音识别失败: ..." }
```

### POST /voice/tts — 文字转语音

Content-Type: `application/json`。

代理到 Voice-Service `POST /api/v1/tts/synthesize`。

### GET /voice/tts/voices — 发音人列表

代理到 Voice-Service `GET /api/v1/tts/voices`。

### GET /voice/tts/status — TTS 状态

### GET /voice/status — 语音服务完整状态 (STT + TTS)

Voice-Service 不可达时返回 502：
```json
{"error":"Voice-Service 不可达: ...","errorType":"voice_service_unreachable"}
```

---

## 6. 文件管理

### POST /files/upload — 上传

Content-Type: `multipart/form-data`。字段 `file`。最大 20MB。

允许 MIME 类型：`image/jpeg,png,gif,webp,svg+xml` | `application/pdf,msword,vnd.openxmlformats-officedocument.wordprocessingml.document` | `text/plain,markdown` | `audio/mpeg,wav,ogg,webm` | `video/mp4,webm`

```json
// 响应 201
{
  "id": "uuid",
  "filename": "string (脱敏后)",
  "mime_type": "string",
  "size": 1024,
  "url": "/api/v1/files/<id>/download"
}
```

错误: 400 `{"error":"文件大小超过限制 (最大 20MB)","errorType":"file_too_large"}`, 400 `{"error":"不支持的文件类型: ...","errorType":"unsupported_type"}`

### GET /files — 列表

`?page=1&limit=20`

```json
// 响应 200
{
  "files": [
    {
      "id": "uuid", "user_id": "string", "filename": "string",
      "mime_type": "string", "size": 1024, "hash": "sha256hex",
      "is_public": false, "created_at": 1717000000000,
      "url": "string", "thumbnail_url": "string (仅图片)"
    }
  ],
  "total": 100, "page": 1, "limit": 20
}
```

### GET /files/:id — 元数据

返回单个 File 对象。

### GET /files/:id/download — 下载

文件流下载。404 → `{"error":"文件实体不存在（可能已被清理）","errorType":"file_missing"}`

### GET /files/:id/thumbnail — 缩略图

图片：JPEG 缩略图 (max 300x300)。非图片：SVG 占位图标。`Cache-Control: public, max-age=86400`

### DELETE /files/:id — 删除

`{"status":"deleted"}`

---

## 7. 图片分析

### POST /images/analyze — 分析

两种方式：
- **JSON:** `{"file_id": "uuid"}` — 分析已上传文件
- **Multipart:** 字段 `file` 或 `image` — 直接上传分析 (max 10MB)，支持 JPEG/PNG/GIF

```json
// 响应 200
{
  "format": "jpeg",
  "width": 1920,
  "height": 1080,
  "file_size": 204800,
  "description": "AI 生成的图片描述",
  "top_colors": [ { "hex": "#4A90D9", "percent": 35.2 } ],
  "exif": { "Make": "Canon" },
  "analyzed_by": "openai_vision|local"
}
```

### GET /images/analyze/:file_id — 按已上传文件分析

同上。

---

## 8. 知识库

### POST /knowledge/bases — 创建知识库

```json
// 请求
{
  "name": "string (必填)",
  "description": "string"
}

// 响应 201
{
  "id": "uuid", "user_id": "string", "name": "string",
  "description": "string", "created_at": "...", "updated_at": "...", "doc_count": 0
}
```

### GET /knowledge/bases — 列表

```json
{ "knowledge_bases": [ KnowledgeBase ], "total": 10 }
```

### GET /knowledge/bases/:id — 详情（含文档列表）

```json
{ "knowledge_base": KnowledgeBase, "documents": [ KnowledgeDocument ] }
```

### PUT /knowledge/bases/:id — 更新

```json
{ "name": "string (必填)", "description": "string" }
→ { "status": "updated" }
```

### DELETE /knowledge/bases/:id — 删除

`{"status":"deleted"}`

---

### POST /knowledge/bases/:id/documents — 添加文档

```json
// 请求
{
  "title": "string (必填)",
  "content": "string (text 类型时)",
  "source_type": "text|file|url (默认 text)",
  "file_id": "string (file 类型必填)"
}

// 响应 201
{
  "id": "uuid", "kb_id": "string", "user_id": "string",
  "title": "string", "source_type": "string", "source_ref": "string",
  "content_type": "string", "raw_content": "string",
  "chunk_count": 5, "created_at": "...", "updated_at": "..."
}
```

注意：`source_type=file` 时 gateway 读取文件内容（仅支持文本类型和 `application/json`）。

### GET /knowledge/bases/:id/documents — 文档列表

`{"documents": [ KnowledgeDocument ], "total": 10}`

### GET /knowledge/documents/:id — 文档详情（含分块）

```json
{
  "document": KnowledgeDocument,
  "chunks": [ KnowledgeChunk ]
}
```

### DELETE /knowledge/documents/:id — 删除

`{"status":"deleted"}`

---

### POST /knowledge/search — 语义搜索

```json
// 请求
{
  "query": "string (必填)",
  "kb_ids": ["uuid"],  // 可选，空=搜索全部
  "limit": 5           // 1-50
}

// 响应 200
{
  "chunks": [ SearchChunkResult ],
  "total": 5,
  "query": "string"
}
```

---

## 9. 记忆管理

代理到 Memory-Service。

### GET /memory/search — 搜索

`?q=<keyword>&user_id=xxx` → 代理到 Memory-Service `POST /memories/query`

### GET /memory — 列表

`?user_id=xxx` → 代理到 Memory-Service `GET /memories`

### POST /memory — 添加

```json
{
  "content": "string (必填)",
  "category": "string (默认 other)",
  "priority": 1
}
```

### DELETE /memory — 删除

`?id=<memory_id>`

Memory-Service 不可达时返回 502：
```json
{"error":"Memory-Service 不可达: ...","errorType":"memory_service_unreachable"}
```

---

## 10. 自动化规则与场景

### 规则

#### GET /automation/rules — 列表

```json
{
  "rules": [
    {
      "id": "32位hex", "user_id": "string", "name": "string",
      "description": "string", "trigger_type": "string",
      "trigger_config": {}, "conditions": {}, "actions": {},
      "enabled": true, "created_at": "..."
    }
  ],
  "count": 5
}
```

#### POST /automation/rules — 创建

```json
// 请求
{
  "name": "string (必填)",
  "description": "string",
  "trigger_type": "string (必填)",
  "trigger_config": {},
  "conditions": {},
  "actions": {} (必填),
  "enabled": true
}

// 响应 201 → {"success": true, "rule": Rule}
```

#### GET /automation/rules/:id — 详情

`{"rule": Rule}` | 404 → `{"error":"规则不存在"}`

#### PUT /automation/rules/:id — 更新

所有字段可选（partial update）。`{"success": true, "rule": Rule}`

#### DELETE /automation/rules/:id — 删除

`{"success": true}`

#### POST /automation/rules/:id/trigger — 手动触发

`{"success": true, "message": "规则已触发"}`

---

### 场景

#### GET /automation/scenes — 列表

`{"scenes": [ Scene ], "count": 5}`

#### POST /automation/scenes — 创建

```json
{
  "name": "string (必填)",
  "icon": "string",
  "rule_ids": ["rule_id_1", "rule_id_2"]
}
→ {"success": true, "scene": Scene}
```

#### GET /automation/scenes/:id — 详情

`{"scene": Scene}`

#### PUT /automation/scenes/:id — 更新

所有字段可选。`{"success": true, "scene": Scene}`

#### DELETE /automation/scenes/:id — 删除

`{"success": true}`

#### POST /automation/scenes/:id/execute — 执行

`{"success": true, "message": "场景已执行"}`

---

## 11. 通知推送

### POST /notifications/push — 推送通知

```json
// 请求
{
  "user_id": "string (必填)",
  "type": "info|warning|success|thinking|reminder (必填)",
  "title": "string (必填)",
  "body": "string (必填)",
  "data": {}
}

// 响应 200
{
  "success": true,
  "notification": {
    "id": "uuid",
    "type": "info",
    "title": "...",
    "user_id": "...",
    "timestamp": "2024-01-01T12:00:00Z",
    "delivered": true
  }
}
```

delivered = true 表示目标用户有活跃 WebSocket 连接。

---

## 12. 提醒管理

### GET /reminders — 列表

`?user_id=xxx&status=pending|completed|cancelled&limit=50&offset=0`

```json
// 响应 200
{
  "reminders": [
    {
      "id": "string", "user_id": "string", "title": "string",
      "description": "string", "remind_at": "2024-01-01T15:00:00Z",
      "status": "pending",
      "repeat_type": "none|daily|weekly|monthly",
      "session_id": "string", "notified": false,
      "created_at": "...", "completed_at": null
    }
  ],
  "count": 5
}
```

### POST /reminders — 创建

```json
// 请求
{
  "title": "string (必填)",
  "description": "string",
  "remind_at": "2024-01-01T15:00:00Z (必填, ISO 8601)",
  "repeat_type": "none|daily|weekly|monthly (默认 none)",
  "session_id": "string"
}

// 响应 201
{ "success": true, "reminder": Reminder }
```

错误: 400 `{"error":"时间格式无效，请使用 ISO 8601 格式 (例如 2024-01-01T15:00:00Z)"}`

### PUT /reminders/:id — 更新

所有字段可选 (partial update)。设置 `status=completed|cancelled` 会自动写入 `completed_at`。

`{"success":true, "reminder":Reminder}` | 404 `{"error":"提醒不存在"}`

### DELETE /reminders/:id — 删除

`{"success":true}`

---

## 13. 每日简报

### GET /briefings — 按日期获取

`?user_id=xxx&date=2024-01-01` (date 默认今天)

```json
// 响应 200
{
  "briefing": {
    "id": "brief_xxx",
    "user_id": "string",
    "date": "2024-01-01",
    "summary": "AI 生成或回退摘要",
    "summary_source": "ai|fallback",
    "status": "pending|generated|delivered",
    "weather": {
      "location": "string", "temp": 22.5,
      "condition": "string", "icon": "☀️"
    },
    "news": [
      { "title": "string", "url": "string", "source": "string", "summary": "string" }
    ],
    "reminders": [
      { "id": "string", "title": "string", "remind_at": "2024-01-01T15:00:00Z" }
    ],
    "created_at": "...", "generated_at": "...", "delivered_at": "..."
  }
}
```

briefing 为 null 时：`{"briefing":null, "message":"当日简报尚未生成"}`

### GET /briefings/latest — 最近简报

`?user_id=xxx&limit=7 (max 30)`

```json
{ "briefings": [ Briefing ], "total": 7 }
```

### POST /briefings/generate — 手动生成

```json
// 请求
{ "user_id": "string (必填)" }

// 响应 200
{ "success": true, "briefing": Briefing, "message": "简报已生成并推送" }
```

---

## 14. Webhook 第三方接入

Auth: `X-Webhook-Key` header。

### POST /webhook/generic — 通用 Webhook

```json
// 请求
{
  "message": "string (必填)",
  "user_id": "string (默认 webhook_generic，自动加 ext_ 前缀)",
  "session_id": "string (默认 webhook_ + 12 随机字符)",
  "mode": "text|voice_msg (默认 text)",
  "platform": "string (默认 generic)"
}

// 响应 200
{
  "reply": "AI 回复文本",
  "session_id": "string",
  "message_id": "string",
  "finish_reason": "stop"
}
```

错误: 400 `{"error":"消息不能为空"}`, 502 `{"error":"AI 服务暂不可用: ..."}`

### POST /webhook/discord — Discord 交互

接收标准 Discord Interaction：
- `type=1` (PING) → `{"type":1}`
- `type=2` (APPLICATION_COMMAND) → 处理 `/chat message:` 命令

```json
// 响应 200
{ "type": 4, "data": { "content": "AI 回复" } }
```

---

## 15. Admin 管理

需要 JWT + admin 权限（`user_id == "admin"`）。非 admin 返回 **403**。

### 会话管理

#### GET /admin/sessions — 活跃会话列表

```json
{ "sessions": [ SessionState ], "total": 5 }
```

#### GET /admin/sessions/active — 按用户分组

```json
{ "users": { "user_id": [ SessionState ] } }
```

#### GET /admin/sessions/:id — 指定会话详情

404 → `{"error":"会话不存在","errorType":"session_not_found"}`

---

### 客户端管理

#### GET /admin/clients — 已知客户端

`?user_id=admin`

```json
{
  "clients": [
    {
      "client_id": "string", "device_name": "string",
      "user_agent": "string", "note": "string",
      "last_seen": 1717000000000, "online": true
    }
  ],
  "total": 3
}
```

#### PUT /admin/clients/:id/note — 设置备注

```json
{ "note": "string" }
→ { "status": "ok", "client_id": "string", "note": "string" }
```

404 → `{"error":"客户端未找到"}`

---

### 模型配置管理

#### GET /admin/models/providers — Provider 列表

```json
{
  "providers": [
    { "name": "string", "base_url": "string", "api_key": "string" }
  ],
  "total": 2
}
```

#### POST /admin/models/providers/:name — 创建/更新 Provider

```json
{ "name": "...", "base_url": "...", "api_key": "..." }
→ { "status": "saved", "name": "string" }
```

#### DELETE /admin/models/providers/:name — 删除

`{"status":"deleted","name":"string"}`

#### GET /admin/models/models — Model 列表

```json
{
  "models": [
    {
      "id": "string", "name": "string", "provider": "string",
      "description": "string", "priority": 1, "tags": [],
      "params": { "temperature": 0.7 }, "enabled": true,
      "updated_at": "..."
    }
  ],
  "total": 5
}
```

#### POST /admin/models/models/:id — 创建/更新 Model

```json
{ "id": "...", "name": "...", "provider": "...", "params": {}, ... }
→ { "status": "saved", "id": "string" }
```

#### DELETE /admin/models/models/:id — 删除

`{"status":"deleted","id":"string"}`

#### GET /admin/models/routing — 路由规则列表

#### POST /admin/models/routing/:purpose — 创建/更新路由规则

```json
{ "purpose": "...", "fallback_chain": ["model1", "model2"], "required": true }
→ { "status": "saved", "purpose": "string" }
```

#### DELETE /admin/models/routing/:purpose — 删除

#### POST /admin/models/health-check — 测试 Provider 连接

```json
{ "provider": "string (必填)" }
→ { "provider": "string", "message": "Provider 配置已保存，连接测试请通过实际 LLM 调用验证" }
```

#### GET /admin/models/fetch-models/:name — 代理获取远程模型列表

`?url=<provider_models_api_url>` → 返回该 Provider 支持的模型列表。

---

## 16. 健康检查

### GET /health — 健康检查

Auth: 无。

```json
{
  "status": "ok",
  "service": "cyrene-gateway",
  "ws_connections": 3
}
```

---

## 附录：错误格式

所有 API 错误统一为：

```json
{
  "error": "错误描述",
  "errorType": "error_code (可选，客户端可据此判断)",
  "hint": "解决建议 (可选)"
}
```

### errorType 列表

| errorType | 含义 |
|-----------|------|
| `session_not_found` | 会话不存在 |
| `file_too_large` | 文件超过大小限制 |
| `unsupported_type` | 不支持的 MIME 类型 |
| `file_missing` | 文件实体已清理 |
| `memory_service_unreachable` | Memory-Service 不可达 |
| `voice_service_unreachable` | Voice-Service 不可达 |
| `admin_only` | 仅限管理员操作 |

### HTTP 状态码

| 状态码 | 场景 |
|--------|------|
| 200 | 成功 |
| 201 | 创建成功 |
| 400 | 请求参数错误 |
| 401 | 未认证 / Token 无效 |
| 403 | 无权限 |
| 404 | 资源不存在 |
| 409 | 资源冲突 (如用户名已存在) |
| 413 | 请求体过大 |
| 502 | 下游服务不可达 |