feat: DevTools综合升级 — 记忆查询 + 会话监看 + WebUI侧边栏重构

- docs: 17个文件重命名为 YYYY-MM-DD.HH-mm-SS-内容.md 格式
- config: 管理员凭据移至 backend/.env (ADMIN_USERNAME/PASSWORD)
- gateway: 新增 SessionState 会话追踪 + GET /api/v1/admin/sessions
- devtools: 新增7个代理端点 (dashboard/sessions/memory)
- devtools: WebUI重构为侧边栏 + 5面板 (仪表盘/记忆/会话/服务/性能)

backend/gateway/internal/handler/chat_handler.go

@@ -1,7 +1,10 @@
 package handler
 
 import (
+	"bytes"
 	"encoding/json"
+	"fmt"
+	"io"
 	"log"
 	"net/http"
 	"time"
@@ -98,25 +101,128 @@ func (h *ChatHandler) handleMessage(client *ws.Client, msg ws.ClientMessage) {
 	}
 }
 
-// handleChatMessage 处理文字聊天消息
+// handleChatMessage 处理文字聊天消息 - 转发到 AI-Core
 func (h *ChatHandler) handleChatMessage(client *ws.Client, msg ws.ClientMessage) {
 	mode := msg.Mode
 	if mode == "" {
 		mode = "text"
 	}
 
-	// MVP阶段：生成模拟回复（后续对接AI-Core）
-	// 实际部署时，这里应转发消息到AI-Core并等待响应
+	// 记录用户消息
+	h.hub.RecordMessage(client.SessionID, "user", msg.Content)
 
+	// 设置会话状态为 thinking
+	h.hub.UpdateSessionState(client.SessionID, "thinking")
+
+	// 构建 AI-Core 请求
+	aiReq := map[string]string{
+		"user_id":    client.UserID,
+		"session_id": client.SessionID,
+		"message":    msg.Content,
+		"mode":       mode,
+	}
+	reqBody, err := json.Marshal(aiReq)
+	if err != nil {
+		log.Printf("[chat] 序列化请求失败: %v", err)
+		h.hub.UpdateSessionState(client.SessionID, "error")
+		client.SendMessage(ws.ServerMessage{
+			Type:      "error",
+			MessageID: "msg_" + generateID(),
+			Error:     "内部错误，请稍后重试",
+			Timestamp: time.Now().UnixMilli(),
+		})
+		return
+	}
+
+	// 调用 AI-Core
+	aiCoreURL := h.cfg.AICoreURL + "/api/v1/chat"
+	httpReq, err := http.NewRequest("POST", aiCoreURL, bytes.NewReader(reqBody))
+	if err != nil {
+		log.Printf("[chat] 创建 AI-Core 请求失败: %v", err)
+		h.hub.UpdateSessionState(client.SessionID, "error")
+		client.SendMessage(ws.ServerMessage{
+			Type:      "error",
+			MessageID: "msg_" + generateID(),
+			Error:     "服务暂不可用",
+			Timestamp: time.Now().UnixMilli(),
+		})
+		return
+	}
+	httpReq.Header.Set("Content-Type", "application/json")
+
+	httpClient := &http.Client{Timeout: 120 * time.Second}
+	resp, err := httpClient.Do(httpReq)
+	if err != nil {
+		log.Printf("[chat] AI-Core 调用失败: %v", err)
+		h.hub.UpdateSessionState(client.SessionID, "error")
+		client.SendMessage(ws.ServerMessage{
+			Type:      "error",
+			MessageID: "msg_" + generateID(),
+			Error:     fmt.Sprintf("AI-Core 调用失败: %v", err),
+			Timestamp: time.Now().UnixMilli(),
+		})
+		return
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		log.Printf("[chat] 读取 AI-Core 响应失败: %v", err)
+		h.hub.UpdateSessionState(client.SessionID, "error")
+		client.SendMessage(ws.ServerMessage{
+			Type:      "error",
+			MessageID: "msg_" + generateID(),
+			Error:     "读取响应失败",
+			Timestamp: time.Now().UnixMilli(),
+		})
+		return
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		log.Printf("[chat] AI-Core 返回错误 [%d]: %s", resp.StatusCode, string(body))
+		h.hub.UpdateSessionState(client.SessionID, "error")
+		client.SendMessage(ws.ServerMessage{
+			Type:      "error",
+			MessageID: "msg_" + generateID(),
+			Error:     fmt.Sprintf("AI-Core 错误 (%d)", resp.StatusCode),
+			Timestamp: time.Now().UnixMilli(),
+		})
+		return
+	}
+
+	// 解析 AI-Core 响应
+	var aiResp struct {
+		Text      string `json:"text"`
+		Mode      string `json:"mode"`
+		MessageID string `json:"message_id"`
+	}
+	if err := json.Unmarshal(body, &aiResp); err != nil {
+		log.Printf("[chat] 解析 AI-Core 响应失败: %v", err)
+		h.hub.UpdateSessionState(client.SessionID, "error")
+		client.SendMessage(ws.ServerMessage{
+			Type:      "error",
+			MessageID: "msg_" + generateID(),
+			Error:     "解析响应失败",
+			Timestamp: time.Now().UnixMilli(),
+		})
+		return
+	}
+
+	// 记录助手响应
+	h.hub.RecordMessage(client.SessionID, "assistant", aiResp.Text)
+
+	// 设置会话状态为 idle
+	h.hub.UpdateSessionState(client.SessionID, "idle")
+
+	// 发送响应给客户端
 	response := ws.ServerMessage{
 		Type:         "response",
-		MessageID:    "msg_" + generateID(),
-		Text:         h.generateMockResponse(msg.Content, mode),
+		MessageID:    aiResp.MessageID,
+		Text:         aiResp.Text,
 		ResponseMode: mode,
 		Timestamp:    time.Now().UnixMilli(),
 	}
 
-	// 发送响应给客户端
 	if err := client.SendMessage(response); err != nil {
 		log.Printf("[WS] 发送响应失败: %v", err)
 	}
@@ -134,22 +240,6 @@ func (h *ChatHandler) handleVoiceInput(client *ws.Client, msg ws.ClientMessage)
 	client.SendMessage(response)
 }
 
-// generateMockResponse 生成模拟回复
-func (h *ChatHandler) generateMockResponse(content, mode string) string {
-	// MVP阶段：没有对接AI-Core时的默认回复
-	responses := []string{
-		"嗯嗯，人家听到了哦♪ 开拓者想和昔涟聊些什么呢？",
-		"嘻嘻，开拓者说的话真有趣呢♪ 让我想想怎么回答……",
-		"啊，这个问题很有意思呢！虽然人家现在还在学习阶段，但我很乐意倾听开拓者说的每一句话哦♡",
-	}
-
-	// 简单hash选一条
-	hash := 0
-	for _, c := range content {
-		hash += int(c)
-	}
-	return responses[hash%len(responses)]
-}
 
 // SendSystemMessage 向用户发送系统消息（用于主动通知）
 func (h *ChatHandler) SendSystemMessage(userID, sessionID, text string) error {