重命名前端项目目录：web-flowith -> web

- 将前端项目目录从 web-flowith 重命名为 web，使目录结构更简洁
- 保持所有前端代码和配置文件不变
- 统一项目目录命名规范

web/src/services/chat.ts

@@ -0,0 +1,51 @@
+import { request } from './api'
+import type { ChatMessage, ChatSession, PaginatedResponse } from '@/types'
+
+export const chatApi = {
+  // 发送AI聊天消息（REST备用，主用WebSocket）
+  sendAiMessage: (conversationId: string, message: string, userId: string): Promise<any> =>
+    request.post('/ai/chat', { conversationId, message, userId }),
+
+  // 创建会话
+  createSession: (userId: string, title: string): Promise<ChatSession> =>
+    request.post('/conversation', { userId, title }),
+
+  // 获取会话分页
+  getSessions: (params: { page: number, size: number, userId?: string }): Promise<PaginatedResponse<ChatSession>> =>
+    request.get('/conversation/page', { params }),
+
+  // 获取用户所有会话
+  getUserSessions: (userId: string): Promise<ChatSession[]> =>
+    request.get(`/conversation/user/${userId}`),
+
+  // 删除会话
+  deleteSession: (id: string): Promise<void> =>
+    request.delete(`/conversation/${id}`),
+
+  // 更新会话标题
+  updateSessionTitle: (id: string, title: string): Promise<ChatSession> =>
+    request.put(`/conversation/${id}`, { title }),
+
+  // 获取会话消息分页
+  getSessionMessages: (conversationId: string, params: { page: number, size: number }): Promise<PaginatedResponse<ChatMessage>> =>
+    request.get(`/message/conversation/${conversationId}/page`, { params }),
+
+  // 获取会话所有消息
+  getAllSessionMessages: (conversationId: string): Promise<ChatMessage[]> =>
+    request.get(`/message/conversation/${conversationId}`),
+
+  // 创建消息（保存到数据库）
+  createMessage: (data: {
+    conversationId: string,
+    userId: string,
+    content: string,
+    contentType?: string,
+    senderType?: string,
+    senderId?: string
+  }): Promise<ChatMessage> =>
+    request.post('/message', data),
+
+  // 聊天统计
+  getChatStats: (userId?: string, conversationId?: string): Promise<any> =>
+    request.get('/ai/stats', { params: { userId, conversationId } }),
+}