Remove conversation grouping feature

internal/handler/conversation.go

@@ -160,24 +160,15 @@ func (h *ConversationHandler) ListConversations(c *gin.Context) {
 		limit = 1000
 	}
 
-	excludeGrouped := strings.TrimSpace(search) == "" && projectID == "" &&
-		(c.Query("exclude_grouped") == "true" || c.Query("exclude_grouped") == "1")
 	sortBy := strings.TrimSpace(c.Query("sort_by"))
 	session, _ := security.CurrentSession(c)
 
 	var conversations []*database.Conversation
 	var total int
 	var err error
-	if excludeGrouped {
-		conversations, err = h.db.ListUngroupedConversationsForAccess(limit, offset, sortBy, projectID, session.UserID, session.Scope)
-		if err == nil {
-			total, err = h.db.CountUngroupedConversationsForAccess(projectID, session.UserID, session.Scope)
-		}
-	} else {
-		conversations, err = h.db.ListConversationsForAccess(limit, offset, search, sortBy, projectID, session.UserID, session.Scope)
-		if err == nil {
-			total, err = h.db.CountConversationsForAccess(search, projectID, session.UserID, session.Scope)
-		}
+	conversations, err = h.db.ListConversationsForAccess(limit, offset, search, sortBy, projectID, session.UserID, session.Scope)
+	if err == nil {
+		total, err = h.db.CountConversationsForAccess(search, projectID, session.UserID, session.Scope)
 	}
 	if err != nil {
 		h.logger.Error("获取对话列表失败", zap.Error(err))
@@ -195,6 +186,35 @@ func (h *ConversationHandler) ListConversations(c *gin.Context) {
 	})
 }
 
+// UpdateConversationPinnedRequest 更新对话置顶状态请求
+type UpdateConversationPinnedRequest struct {
+	Pinned bool `json:"pinned"`
+}
+
+// UpdateConversationPinned 更新对话置顶状态
+func (h *ConversationHandler) UpdateConversationPinned(c *gin.Context) {
+	conversationID := c.Param("id")
+	session, ok := security.CurrentSession(c)
+	if !ok || !h.db.UserCanAccessResource(session.UserID, session.Scope, "conversation", conversationID) {
+		c.JSON(http.StatusForbidden, gin.H{"error": "无权访问该资源"})
+		return
+	}
+
+	var req UpdateConversationPinnedRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	if err := h.db.UpdateConversationPinned(conversationID, req.Pinned); err != nil {
+		h.logger.Error("更新对话置顶状态失败", zap.Error(err))
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"message": "更新成功"})
+}
+
 // GetConversation 获取对话
 func (h *ConversationHandler) GetConversation(c *gin.Context) {
 	id := c.Param("id")