feat: DevTools 数据库监看面板 + 隧道控制 + 多项 Bug 修复

**DevTools 新增功能 (Tasks 13-14):**
- 首页仪表盘添加数据库实时监看卡片 (5端口状态 + 记忆数)
- 侧边栏新增数据库面板，支持自动 5 秒刷新
- 数据库面板显示 PostgreSQL/Redis/Qdrant/MinIO/NATS 端口状态
- 隧道控制按钮 (启动/停止/重启/查看状态)
- 新增 API 端点: GET /api/database/status, POST /api/tunnel/:action
- 更新 docs/api-reference/ API 文档

**Bug 修复 (Task 15):**
- 修复 pgrep -f 自匹配导致隧道状态误判 (添加 ^ssh 锚点)
  - devtools/src/index.js (dashboard + database/status)
  - scripts/tunnel.sh (is_tunnel_running + show_status)
- 修复数据库面板缺少自动刷新定时器
- 修复侧边栏数据库徽章永远 display:none
- 修复僵尸进程场景下按钮死锁问题

**其他改进:**
- .gitignore 添加 backend/cmd, backend/iot-debug-service/main
- 前端多项改进 (登录/注册/会话/流式动画等)

backend/ai-core/cmd/main.go

@@ -389,9 +389,10 @@ func handleChat(
 
 			// 将助手消息（含工具调用）加入上下文
 			assistantMsg := model.LLMMessage{
-				Role:      model.RoleAssistant,
-				Content:   syncResp.Content,
-				ToolCalls: syncResp.ToolCalls,
+				Role:             model.RoleAssistant,
+				Content:          syncResp.Content,
+				ToolCalls:        syncResp.ToolCalls,
+				ReasoningContent: syncResp.ReasoningContent,
 			}
 			llmMessages = append(llmMessages, assistantMsg)
 

backend/ai-core/internal/background/thinker.go

@@ -0,0 +1,349 @@
+package background
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/yourname/cyrene-ai/ai-core/internal/llm"
+	"github.com/yourname/cyrene-ai/ai-core/internal/memory"
+	"github.com/yourname/cyrene-ai/ai-core/internal/model"
+	"github.com/yourname/cyrene-ai/ai-core/internal/persona"
+	"github.com/yourname/cyrene-ai/ai-core/internal/tools"
+)
+
+// PendingThought 待推送的后台思考
+type PendingThought struct {
+	Content   string    `json:"content"`
+	CreatedAt time.Time `json:"created_at"`
+	Consumed  bool      `json:"consumed"`
+}
+
+// Thinker 后台思考器
+type Thinker struct {
+	mu               sync.Mutex
+	enabled          bool
+	personaLoader    *persona.Loader
+	memRetriever     *memory.Retriever
+	llmAdapter       *llm.Adapter
+	iotClient        *tools.IoTClient
+	idleTimeout      time.Duration // 闲置超时
+	thinkInterval    time.Duration // 两次思考最小间隔
+	iotQueryInterval time.Duration // IoT查询最小间隔
+
+	pendingThoughts []*PendingThought
+
+	lastUserMessage time.Time
+	lastThinkTime   time.Time
+	lastIoTQuery    time.Time
+	stopCh          chan struct{}
+	wg              sync.WaitGroup
+}
+
+// ThinkerConfig 后台思考配置
+type ThinkerConfig struct {
+	Enabled          bool
+	IdleTimeout      time.Duration
+	ThinkInterval    time.Duration
+	IoTQueryInterval time.Duration
+}
+
+// DefaultThinkerConfig 默认配置
+func DefaultThinkerConfig() ThinkerConfig {
+	return ThinkerConfig{
+		Enabled:          getEnvBool("ENABLE_BACKGROUND_THINKING", true),
+		IdleTimeout:      getEnvDuration("THINK_IDLE_TIMEOUT_SEC", 120),
+		ThinkInterval:    getEnvDuration("THINK_INTERVAL_SEC", 300),
+		IoTQueryInterval: getEnvDuration("IOT_QUERY_INTERVAL_SEC", 600),
+	}
+}
+
+// NewThinker 创建后台思考器
+func NewThinker(
+	cfg ThinkerConfig,
+	personaLoader *persona.Loader,
+	memRetriever *memory.Retriever,
+	llmAdapter *llm.Adapter,
+	iotClient *tools.IoTClient,
+) *Thinker {
+	return &Thinker{
+		enabled:          cfg.Enabled,
+		personaLoader:    personaLoader,
+		memRetriever:     memRetriever,
+		llmAdapter:       llmAdapter,
+		iotClient:        iotClient,
+		idleTimeout:      cfg.IdleTimeout,
+		thinkInterval:    cfg.ThinkInterval,
+		iotQueryInterval: cfg.IoTQueryInterval,
+		pendingThoughts:  make([]*PendingThought, 0),
+		lastUserMessage:  time.Now(),
+		stopCh:           make(chan struct{}),
+	}
+}
+
+// Start 启动后台思考循环
+func (t *Thinker) Start() {
+	if !t.enabled {
+		log.Println("[后台思考] 已禁用 (ENABLE_BACKGROUND_THINKING=false)")
+		return
+	}
+
+	t.wg.Add(1)
+	go t.loop()
+	log.Printf("[后台思考] 已启动 (闲置超时=%v, 思考间隔=%v, IoT查询间隔=%v)",
+		t.idleTimeout, t.thinkInterval, t.iotQueryInterval)
+}
+
+// Stop 停止后台思考
+func (t *Thinker) Stop() {
+	close(t.stopCh)
+	t.wg.Wait()
+	log.Println("[后台思考] 已停止")
+}
+
+// RecordUserMessage 记录用户活动时间
+func (t *Thinker) RecordUserMessage() {
+	t.mu.Lock()
+	t.lastUserMessage = time.Now()
+	t.mu.Unlock()
+}
+
+// GetPendingThoughts 获取并消费所有待处理的后台思考
+func (t *Thinker) GetPendingThoughts() []*PendingThought {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+
+	if len(t.pendingThoughts) == 0 {
+		return nil
+	}
+
+	result := t.pendingThoughts
+	t.pendingThoughts = make([]*PendingThought, 0)
+
+	// 标记已消费
+	for _, pt := range result {
+		pt.Consumed = true
+	}
+	return result
+}
+
+// HasPendingThoughts 检查是否有待处理的思考
+func (t *Thinker) HasPendingThoughts() bool {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	return len(t.pendingThoughts) > 0
+}
+
+// loop 后台主循环
+func (t *Thinker) loop() {
+	defer t.wg.Done()
+
+	ticker := time.NewTicker(10 * time.Second) // 每10秒检查一次
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-t.stopCh:
+			return
+		case <-ticker.C:
+			t.checkAndThink()
+		}
+	}
+}
+
+// checkAndThink 检查是否需要触发思考
+func (t *Thinker) checkAndThink() {
+	t.mu.Lock()
+
+	// 检查空闲时间是否超过阈值
+	idleDuration := time.Since(t.lastUserMessage)
+	if idleDuration < t.idleTimeout {
+		t.mu.Unlock()
+		return
+	}
+
+	// 检查距离上次思考是否超过最小间隔
+	if time.Since(t.lastThinkTime) < t.thinkInterval {
+		t.mu.Unlock()
+		return
+	}
+
+	t.lastThinkTime = time.Now()
+	t.mu.Unlock()
+
+	// 执行后台思考（不持锁）
+	t.performThink()
+}
+
+// performThink 执行一次后台思考
+func (t *Thinker) performThink() {
+	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
+	defer cancel()
+
+	// 加载人格配置
+	personaConfig, err := t.personaLoader.Get("cyrene")
+	if err != nil {
+		log.Printf("[后台思考] 加载人格失败: %v", err)
+		return
+	}
+
+	// 检索最近的记忆
+	var memories []memory.MemoryEntry
+	if t.memRetriever != nil {
+		memories, err = t.memRetriever.Retrieve(ctx, "system", "最近发生了什么 重要的事情")
+		if err != nil {
+			log.Printf("[后台思考] 记忆检索失败: %v", err)
+		}
+	}
+
+	// 查询 IoT 设备状态（节制）
+	var deviceSummary string
+	if t.iotClient != nil && time.Since(t.lastIoTQuery) >= t.iotQueryInterval {
+		devices := t.iotClient.GetDevicesForContext()
+		if len(devices) > 0 {
+			deviceSummary = formatDeviceContext(devices)
+		}
+		t.mu.Lock()
+		t.lastIoTQuery = time.Now()
+		t.mu.Unlock()
+	}
+
+	// 构建思考提示
+	systemPrompt := personaConfig.BuildSystemPrompt("开拓者", 1)
+
+	memoryContext := ""
+	if len(memories) > 0 {
+		memoryContext = "【最近的记忆】\n"
+		for _, m := range memories {
+			if len(memoryContext)+len(m.Content) > 500 {
+				break // 限制记忆上下文长度
+			}
+			memoryContext += fmt.Sprintf("- %s\n", m.Content)
+		}
+	}
+
+	userPrompt := "昔涟，现在是你的后台思考时间。开拓者暂时没有说话。"
+	userPrompt += "\n请你基于以下信息进行简短思考：你注意到了什么？有什么想对开拓者说的吗？"
+	userPrompt += "\n注意：这是内部思考，不是直接对话，请以第三人称或自省的方式思考。"
+
+	if memoryContext != "" {
+		userPrompt += "\n\n" + memoryContext
+	}
+	if deviceSummary != "" {
+		userPrompt += "\n\n" + deviceSummary
+	}
+
+	// 调用 LLM
+	messages := []model.LLMMessage{
+		{Role: model.RoleSystem, Content: systemPrompt},
+		{Role: model.RoleUser, Content: userPrompt},
+	}
+
+	resp, err := t.llmAdapter.Chat(ctx, messages)
+	if err != nil {
+		log.Printf("[后台思考] LLM调用失败: %v", err)
+		return
+	}
+
+	if resp.Content == "" {
+		return
+	}
+
+	// 存储思考结果
+	t.mu.Lock()
+	t.pendingThoughts = append(t.pendingThoughts, &PendingThought{
+		Content:   resp.Content,
+		CreatedAt: time.Now(),
+		Consumed:  false,
+	})
+
+	// 只保留最近5条
+	if len(t.pendingThoughts) > 5 {
+		t.pendingThoughts = t.pendingThoughts[len(t.pendingThoughts)-5:]
+	}
+	count := len(t.pendingThoughts)
+	t.mu.Unlock()
+
+	log.Printf("[后台思考] 完成 (当前累积 %d 条待推送思考)", count)
+}
+
+// formatDeviceContext 格式化设备状态为文本
+func formatDeviceContext(devices []tools.IoTDevice) string {
+	if len(devices) == 0 {
+		return ""
+	}
+
+	summary := "[当前IoT设备状态]\n"
+	for _, d := range devices {
+		switch d.Type {
+		case "light":
+			if d.Status == "on" {
+				summary += fmt.Sprintf("- %s: 开启 (亮度%d%%, %s)\n", d.Name, d.Brightness, d.Color)
+			} else {
+				summary += fmt.Sprintf("- %s: 关闭\n", d.Name)
+			}
+		case "ac":
+			if d.Status == "on" {
+				summary += fmt.Sprintf("- %s: 运行中 (%s%.0f°C)\n", d.Name, modeLabel(d.Mode), d.Temperature)
+			} else {
+				summary += fmt.Sprintf("- %s: 关闭\n", d.Name)
+			}
+		case "curtain":
+			statusLabel := "已关闭"
+			if d.Status == "open" {
+				statusLabel = "已打开"
+			}
+			summary += fmt.Sprintf("- %s: %s\n", d.Name, statusLabel)
+		case "sensor":
+			summary += fmt.Sprintf("- %s: %.1f%s\n", d.Name, d.Value, d.Unit)
+		case "lock":
+			statusLabel := "已锁定"
+			if d.Status == "unlocked" {
+				statusLabel = "已解锁"
+			}
+			summary += fmt.Sprintf("- %s: %s (电量%d%%)\n", d.Name, statusLabel, d.Battery)
+		}
+	}
+	return summary
+}
+
+func modeLabel(mode string) string {
+	switch mode {
+	case "cool":
+		return "制冷"
+	case "heat":
+		return "制热"
+	case "auto":
+		return "自动"
+	default:
+		return mode
+	}
+}
+
+func getEnvBool(key string, fallback bool) bool {
+	v := os.Getenv(key)
+	if v == "" {
+		return fallback
+	}
+	b, err := strconv.ParseBool(v)
+	if err != nil {
+		return fallback
+	}
+	return b
+}
+
+func getEnvDuration(key string, fallbackSec int) time.Duration {
+	v := os.Getenv(key)
+	if v == "" {
+		return time.Duration(fallbackSec) * time.Second
+	}
+	sec, err := strconv.Atoi(v)
+	if err != nil {
+		return time.Duration(fallbackSec) * time.Second
+	}
+	return time.Duration(sec) * time.Second
+}

backend/ai-core/internal/context/builder.go

@@ -4,22 +4,97 @@ import (
     "context"
     "fmt"
     "log"
+    "strings"
+    "sync"
 
     "github.com/yourname/cyrene-ai/ai-core/internal/memory"
     "github.com/yourname/cyrene-ai/ai-core/internal/model"
     "github.com/yourname/cyrene-ai/ai-core/internal/persona"
 )
 
+// IoTDeviceSummary IoT设备摘要接口（避免循环依赖）
+type IoTDeviceSummary interface {
+    GetName() string
+    GetType() string
+    GetStatus() string
+}
+
+// ConversationStore 会话历史存储接口
+type ConversationStore struct {
+    mu         sync.RWMutex
+    messages   map[string][]model.LLMMessage // key = sessionID
+    maxHistory int
+}
+
+// NewConversationStore 创建会话历史存储
+func NewConversationStore(maxHistory int) *ConversationStore {
+    return &ConversationStore{
+        messages:   make(map[string][]model.LLMMessage),
+        maxHistory: maxHistory,
+    }
+}
+
+// AddMessage 添加消息到会话历史
+func (cs *ConversationStore) AddMessage(sessionID string, msg model.LLMMessage) {
+    cs.mu.Lock()
+    defer cs.mu.Unlock()
+
+    msgs := cs.messages[sessionID]
+    msgs = append(msgs, msg)
+
+    // 限制历史长度
+    if len(msgs) > cs.maxHistory {
+        // 保留 system 消息在开头，只裁剪 user/assistant 消息
+        cutoff := len(msgs) - cs.maxHistory
+        for cutoff < len(msgs) && msgs[cutoff].Role == model.RoleSystem {
+            cutoff++
+        }
+        if cutoff > 0 {
+            msgs = msgs[cutoff:]
+        }
+    }
+    cs.messages[sessionID] = msgs
+}
+
+// GetHistory 获取会话历史
+func (cs *ConversationStore) GetHistory(sessionID string, limit int) []model.LLMMessage {
+    cs.mu.RLock()
+    defer cs.mu.RUnlock()
+
+    msgs := cs.messages[sessionID]
+    if len(msgs) == 0 {
+        return nil
+    }
+
+    start := 0
+    if limit > 0 && len(msgs) > limit {
+        start = len(msgs) - limit
+    }
+
+    result := make([]model.LLMMessage, len(msgs[start:]))
+    copy(result, msgs[start:])
+    return result
+}
+
 // Builder 对话上下文构建器
-type Builder struct{}
+type Builder struct {
+    convStore *ConversationStore
+}
+
+// NewBuilder 创建上下文构建器
+func NewBuilder(convStore *ConversationStore) *Builder {
+    return &Builder{convStore: convStore}
+}
 
 type BuildParams struct {
-    UserID       string
-    SessionID    string
-    UserMessage  string
-    Persona      *persona.PersonaConfig
-    Memories     []memory.MemoryEntry
-    HistoryLimit int
+    UserID          string
+    SessionID       string
+    UserMessage     string
+    Persona         *persona.PersonaConfig
+    Memories        []memory.MemoryEntry
+    HistoryLimit    int
+    DeviceContext   string   // 注入的设备状态文本
+    PendingThoughts []string // 待注入的后台思考
 }
 
 // Build 构建发送给LLM的完整消息列表
@@ -28,9 +103,23 @@ func (b *Builder) Build(ctx context.Context, params BuildParams) ([]model.LLMMes
 
     // 1. 系统消息 —— 昔涟的人格Prompt
     systemPrompt := params.Persona.BuildSystemPrompt(
-        params.UserID, // 后续可替换为真实用户名
-        1,             // 初始好感度
+        params.UserID,
+        1,
     )
+
+    // 1.1 注入设备上下文到系统消息
+    if params.DeviceContext != "" {
+        systemPrompt += "\n\n" + params.DeviceContext
+    }
+
+    // 1.2 注入后台思考到系统消息（不打扰地）
+    if len(params.PendingThoughts) > 0 {
+        systemPrompt += "\n\n【昔涟的内心思考（仅供你参考，不要直接复述，请自然地融入对话）】\n"
+        for _, thought := range params.PendingThoughts {
+            systemPrompt += fmt.Sprintf("- %s\n", thought)
+        }
+    }
+
     messages = append(messages, model.LLMMessage{
         Role:    "system",
         Content: systemPrompt,
@@ -63,8 +152,99 @@ func (b *Builder) Build(ctx context.Context, params BuildParams) ([]model.LLMMes
     return messages, nil
 }
 
-// loadHistory 加载会话历史 (MVP阶段返回空，后续对接数据库)
+// loadHistory 从 ConversationStore 加载会话历史
 func (b *Builder) loadHistory(_ context.Context, sessionID string, limit int) ([]model.LLMMessage, error) {
-    log.Printf("[context] 加载会话 %s 历史 (限制 %d 条) - 暂未实现持久化", sessionID, limit)
-    return nil, nil
+    if b.convStore == nil {
+        log.Printf("[context] 会话历史存储未初始化，跳过加载")
+        return nil, nil
+    }
+
+    history := b.convStore.GetHistory(sessionID, limit)
+    if len(history) == 0 {
+        log.Printf("[context] 会话 %s 无历史记录", sessionID)
+        return nil, nil
+    }
+
+    log.Printf("[context] 加载会话 %s 历史 %d 条", sessionID, len(history))
+    return history, nil
+}
+
+// CacheMessage 缓存消息到会话历史（供chat handler在回复后调用）
+func (b *Builder) CacheMessage(sessionID string, role model.Role, content string) {
+    if b.convStore == nil {
+        return
+    }
+    b.convStore.AddMessage(sessionID, model.LLMMessage{
+        Role:    role,
+        Content: content,
+    })
+}
+
+// InjectDeviceContext 将设备状态格式化为简洁的文本注入系统上下文
+func InjectDeviceContext(devices []DeviceInfo) string {
+    if len(devices) == 0 {
+        return ""
+    }
+
+    var sb strings.Builder
+    sb.WriteString("[当前IoT设备状态]\n")
+    for _, d := range devices {
+        switch d.Type {
+        case "light":
+            if d.Status == "on" {
+                sb.WriteString(fmt.Sprintf("- %s: 开启 (亮度%d%%, %s)\n", d.Name, d.Brightness, d.Color))
+            } else {
+                sb.WriteString(fmt.Sprintf("- %s: 关闭\n", d.Name))
+            }
+        case "ac":
+            if d.Status == "on" {
+                modeLabel := acModeLabel(d.Mode)
+                sb.WriteString(fmt.Sprintf("- %s: 运行中 (%s%.0f°C)\n", d.Name, modeLabel, d.Temperature))
+            } else {
+                sb.WriteString(fmt.Sprintf("- %s: 关闭\n", d.Name))
+            }
+        case "curtain":
+            statusLabel := "已关闭"
+            if d.Status == "open" {
+                statusLabel = "已打开"
+            }
+            sb.WriteString(fmt.Sprintf("- %s: %s\n", d.Name, statusLabel))
+        case "sensor":
+            sb.WriteString(fmt.Sprintf("- %s: %.1f%s\n", d.Name, d.Value, d.Unit))
+        case "lock":
+            statusLabel := "已锁定"
+            if d.Status == "unlocked" {
+                statusLabel = "已解锁"
+            }
+            sb.WriteString(fmt.Sprintf("- %s: %s (电量%d%%)\n", d.Name, statusLabel, d.Battery))
+        }
+    }
+    return sb.String()
+}
+
+// DeviceInfo 设备信息（避免循环依赖的简化结构体）
+type DeviceInfo struct {
+    Name        string
+    Type        string
+    Status      string
+    Brightness  int
+    Color       string
+    Temperature float64
+    Mode        string
+    Value       float64
+    Unit        string
+    Battery     int
+}
+
+func acModeLabel(mode string) string {
+    switch mode {
+    case "cool":
+        return "制冷"
+    case "heat":
+        return "制热"
+    case "auto":
+        return "自动"
+    default:
+        return mode
+    }
 }

backend/ai-core/internal/llm/openai.go

@@ -60,11 +60,12 @@ type openAIRequest struct {
 }
 
 type openAIMessage struct {
-	Role       string            `json:"role"`
-	Content    string            `json:"content,omitempty"`
-	Name       string            `json:"name,omitempty"`
-	ToolCalls  []openAIToolCall  `json:"tool_calls,omitempty"`
-	ToolCallID string            `json:"tool_call_id,omitempty"`
+	Role             string            `json:"role"`
+	Content          string            `json:"content,omitempty"`
+	Name             string            `json:"name,omitempty"`
+	ToolCalls        []openAIToolCall  `json:"tool_calls,omitempty"`
+	ToolCallID       string            `json:"tool_call_id,omitempty"`
+	ReasoningContent string            `json:"reasoning_content,omitempty"` // DeepSeek 思考链
 }
 
 // openAIToolCall OpenAI工具调用
@@ -226,10 +227,11 @@ func (p *OpenAIProvider) doChat(ctx context.Context, messages []model.LLMMessage
 	oaiMessages := make([]openAIMessage, len(messages))
 	for i, msg := range messages {
 		oaiMsg := openAIMessage{
-			Role:       string(msg.Role),
-			Content:    msg.Content,
-			Name:       msg.Name,
-			ToolCallID: msg.ToolCallID,
+			Role:             string(msg.Role),
+			Content:          msg.Content,
+			Name:             msg.Name,
+			ToolCallID:       msg.ToolCallID,
+			ReasoningContent: msg.ReasoningContent,
 		}
 		// 转换工具调用
 		if len(msg.ToolCalls) > 0 {
@@ -303,8 +305,9 @@ func (p *OpenAIProvider) doChat(ctx context.Context, messages []model.LLMMessage
 	// 检查是否有工具调用
 	choice := oaiResp.Choices[0]
 	llmResp := &model.LLMResponse{
-		Content:      choice.Message.Content,
-		FinishReason: choice.FinishReason,
+		Content:          choice.Message.Content,
+		FinishReason:     choice.FinishReason,
+		ReasoningContent: choice.Message.ReasoningContent,
 		Usage: model.Usage{
 			PromptTokens:     oaiResp.Usage.PromptTokens,
 			CompletionTokens: oaiResp.Usage.CompletionTokens,
@@ -331,10 +334,11 @@ func (p *OpenAIProvider) doChatStream(ctx context.Context, messages []model.LLMM
 	oaiMessages := make([]openAIMessage, len(messages))
 	for i, msg := range messages {
 		oaiMsg := openAIMessage{
-			Role:       string(msg.Role),
-			Content:    msg.Content,
-			Name:       msg.Name,
-			ToolCallID: msg.ToolCallID,
+			Role:             string(msg.Role),
+			Content:          msg.Content,
+			Name:             msg.Name,
+			ToolCallID:       msg.ToolCallID,
+			ReasoningContent: msg.ReasoningContent,
 		}
 		if len(msg.ToolCalls) > 0 {
 			oaiMsg.ToolCalls = make([]openAIToolCall, len(msg.ToolCalls))

backend/ai-core/internal/model/message.go

@@ -14,11 +14,12 @@ const (
 
 // LLMMessage 发送给LLM的消息
 type LLMMessage struct {
-	Role       Role       `json:"role"`
-	Content    string     `json:"content"`
-	Name       string     `json:"name,omitempty"`        // 可选发送者名称
-	ToolCallID string     `json:"tool_call_id,omitempty"` // 工具调用关联ID (tool role 消息关联调用)
-	ToolCalls  []ToolCall `json:"tool_calls,omitempty"`   // 助手消息中的工具调用列表
+	Role             Role       `json:"role"`
+	Content          string     `json:"content"`
+	Name             string     `json:"name,omitempty"`              // 可选发送者名称
+	ToolCallID       string     `json:"tool_call_id,omitempty"`       // 工具调用关联ID (tool role 消息关联调用)
+	ToolCalls        []ToolCall `json:"tool_calls,omitempty"`         // 助手消息中的工具调用列表
+	ReasoningContent string     `json:"reasoning_content,omitempty"` // DeepSeek 思考链内容（需回传）
 }
 
 // ChatMessage 数据库存储的对话消息
@@ -34,10 +35,11 @@ type ChatMessage struct {
 
 // LLMResponse LLM返回的响应
 type LLMResponse struct {
-	Content      string      `json:"content"`
-	FinishReason string      `json:"finish_reason"` // stop | length | tool_calls
-	ToolCalls    []ToolCall  `json:"tool_calls,omitempty"`
-	Usage        Usage       `json:"usage,omitempty"`
+	Content          string      `json:"content"`
+	FinishReason     string      `json:"finish_reason"` // stop | length | tool_calls
+	ToolCalls        []ToolCall  `json:"tool_calls,omitempty"`
+	Usage            Usage       `json:"usage,omitempty"`
+	ReasoningContent string      `json:"reasoning_content,omitempty"` // DeepSeek 思考链内容
 }
 
 // ToolCall 工具调用

backend/ai-core/internal/orchestrator/orchestrator.go

@@ -4,7 +4,6 @@ import (
     "context"
     "fmt"
     "strings"
-    "unicode"
 
     "github.com/yourname/cyrene-ai/ai-core/internal/llm"
     "github.com/yourname/cyrene-ai/ai-core/internal/memory"
@@ -142,5 +141,3 @@ func isSentenceEnd(r rune) bool {
     return false
 }
 
-// Ensure unicode is used
-var _ = unicode.Is