feat: 添加双人对练功能

- 新增数据库迁移脚本 (practice_rooms, practice_room_messages)
- 新增后端 API: 房间创建/加入/消息同步/报告生成
- 新增前端页面: 入口页/对练房间/报告页
- 新增 AI 双人评估服务和提示词

frontend/src/api/duoPractice.ts

@@ -0,0 +1,187 @@
+/**
+ * 双人对练 API
+ */
+import request from '@/api/request'
+
+// ==================== 类型定义 ====================
+
+export interface CreateRoomRequest {
+  scene_id?: number
+  scene_name?: string
+  scene_type?: string
+  scene_background?: string
+  role_a_name?: string
+  role_b_name?: string
+  role_a_description?: string
+  role_b_description?: string
+  host_role?: 'A' | 'B'
+  room_name?: string
+}
+
+export interface CreateRoomResponse {
+  room_code: string
+  room_id: number
+  room_name: string
+  my_role: string
+  my_role_name: string
+}
+
+export interface JoinRoomResponse {
+  room_code: string
+  room_id: number
+  room_name: string
+  status: string
+  my_role: string
+  my_role_name: string
+}
+
+export interface RoomUser {
+  id: number
+  username: string
+  full_name: string
+  avatar_url?: string
+}
+
+export interface RoomInfo {
+  id: number
+  room_code: string
+  room_name?: string
+  scene_id?: number
+  scene_name?: string
+  scene_type?: string
+  scene_background?: string
+  role_a_name: string
+  role_b_name: string
+  role_a_description?: string
+  role_b_description?: string
+  host_role: string
+  status: string
+  created_at?: string
+  started_at?: string
+  ended_at?: string
+  duration_seconds: number
+  total_turns: number
+  role_a_turns: number
+  role_b_turns: number
+}
+
+export interface RoomDetailResponse {
+  room: RoomInfo
+  host_user?: RoomUser
+  guest_user?: RoomUser
+  host_role_name?: string
+  guest_role_name?: string
+  my_role?: string
+  my_role_name?: string
+  is_host: boolean
+}
+
+export interface RoomMessage {
+  id: number
+  room_id: number
+  user_id?: number
+  message_type: 'chat' | 'system' | 'join' | 'leave' | 'start' | 'end'
+  content?: string
+  role_name?: string
+  sequence: number
+  created_at: string
+}
+
+export interface MessagesResponse {
+  messages: RoomMessage[]
+  room_status: string
+  last_sequence: number
+}
+
+export interface RoomListItem {
+  id: number
+  room_code: string
+  room_name?: string
+  scene_name?: string
+  status: string
+  is_host: boolean
+  created_at?: string
+  duration_seconds: number
+  total_turns: number
+}
+
+// ==================== API 函数 ====================
+
+/**
+ * 创建房间
+ */
+export function createRoom(data: CreateRoomRequest) {
+  return request.post<CreateRoomResponse>('/api/v1/practice/rooms', data)
+}
+
+/**
+ * 加入房间
+ */
+export function joinRoom(roomCode: string) {
+  return request.post<JoinRoomResponse>('/api/v1/practice/rooms/join', {
+    room_code: roomCode
+  })
+}
+
+/**
+ * 获取房间详情
+ */
+export function getRoomDetail(roomCode: string) {
+  return request.get<RoomDetailResponse>(`/api/v1/practice/rooms/${roomCode}`)
+}
+
+/**
+ * 开始对练
+ */
+export function startPractice(roomCode: string) {
+  return request.post(`/api/v1/practice/rooms/${roomCode}/start`)
+}
+
+/**
+ * 结束对练
+ */
+export function endPractice(roomCode: string) {
+  return request.post(`/api/v1/practice/rooms/${roomCode}/end`)
+}
+
+/**
+ * 离开房间
+ */
+export function leaveRoom(roomCode: string) {
+  return request.post(`/api/v1/practice/rooms/${roomCode}/leave`)
+}
+
+/**
+ * 发送消息
+ */
+export function sendMessage(roomCode: string, content: string) {
+  return request.post<RoomMessage>(`/api/v1/practice/rooms/${roomCode}/message`, {
+    content
+  })
+}
+
+/**
+ * 获取消息列表
+ */
+export function getMessages(roomCode: string, sinceSequence: number = 0) {
+  return request.get<MessagesResponse>(`/api/v1/practice/rooms/${roomCode}/messages`, {
+    params: { since_sequence: sinceSequence }
+  })
+}
+
+/**
+ * 获取我的房间列表
+ */
+export function getMyRooms(status?: string, limit: number = 20) {
+  return request.get<{ rooms: RoomListItem[] }>('/api/v1/practice/rooms', {
+    params: { status, limit }
+  })
+}
+
+/**
+ * 生成分享链接
+ */
+export function generateShareLink(roomCode: string): string {
+  const baseUrl = window.location.origin
+  return `${baseUrl}/trainee/duo-practice/join/${roomCode}`
+}