feat: 全平台打包 + CI/CD 自动构建工作流

- 修复移动端: axios替换为原生fetch (React Native兼容)
- 新增 .gitea/workflows/build.yml CI/CD工作流:
  - Windows: NSIS安装包 (windows-latest)
  - macOS: DMG x64+arm64 (macos-latest)
  - Linux: AppImage+deb (ubuntu-latest)
  - Android: APK via expo prebuild + gradle (ubuntu-latest)
  - iOS: simulator build (macos-latest)
  - 移动端JS Bundle导出 (android+ios)
  - 自动创建Release (tag触发)

本地已构建产物:
- client/release/FunConnect-1.1.0-Win-x64.exe (73MB)
- client/release/FunConnect-1.1.0-Linux-x64.zip (99MB)
- mobile JS bundles (android + ios) 已验证导出成功

mobile/src/lib/api.ts

@@ -1,4 +1,3 @@
-import axios, { AxiosInstance } from 'axios';
 import AsyncStorage from '@react-native-async-storage/async-storage';
 
 export interface RoomInfo {
@@ -28,54 +27,70 @@ export interface ServerStats {
   cluster: { totalNodes: number; onlineNodes: number; totalRooms: number; totalPlayers: number } | null;
 }
 
+async function request(url: string, options?: RequestInit) {
+  const controller = new AbortController();
+  const timeout = setTimeout(() => controller.abort(), 10000);
+  try {
+    const res = await fetch(url, { ...options, signal: controller.signal });
+    const data = await res.json();
+    if (!res.ok) throw new Error(data.error || `HTTP ${res.status}`);
+    return data;
+  } finally {
+    clearTimeout(timeout);
+  }
+}
+
 class ApiClient {
-  private http: AxiosInstance | null = null;
   private baseUrl: string = '';
+  private configured: boolean = false;
 
   configure(url: string) {
     this.baseUrl = url.replace(/\/+$/, '');
-    this.http = axios.create({ baseURL: `${this.baseUrl}/api`, timeout: 10000 });
+    this.configured = true;
   }
 
-  get isConfigured() { return !!this.http; }
+  get isConfigured() { return this.configured; }
   get serverUrl() { return this.baseUrl; }
 
+  private api(path: string) { return `${this.baseUrl}/api${path}`; }
+
   async getHealth(): Promise<ServerHealth> {
-    const res = await this.http!.get('/health');
-    return res.data;
+    return request(this.api('/health'));
   }
 
   async getStats(): Promise<ServerStats> {
-    const res = await this.http!.get('/stats');
-    return res.data;
+    return request(this.api('/stats'));
   }
 
   async getRooms(): Promise<{ rooms: RoomInfo[]; total: number }> {
-    const res = await this.http!.get('/rooms');
-    return res.data;
+    return request(this.api('/rooms'));
   }
 
   async createRoom(data: {
     name: string; hostName: string; hostPort: number;
     gameVersion: string; gameEdition: string; maxPlayers: number; password?: string;
   }) {
-    const res = await this.http!.post('/rooms', data);
-    return res.data;
+    return request(this.api('/rooms'), {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(data),
+    });
   }
 
   async joinRoom(roomId: string, password?: string) {
-    const res = await this.http!.post(`/rooms/${roomId}/join`, { password });
-    return res.data;
+    return request(this.api(`/rooms/${roomId}/join`), {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ password }),
+    });
   }
 
   async deleteRoom(roomId: string) {
-    const res = await this.http!.delete(`/rooms/${roomId}`);
-    return res.data;
+    return request(this.api(`/rooms/${roomId}`), { method: 'DELETE' });
   }
 
   async getTraffic() {
-    const res = await this.http!.get('/traffic');
-    return res.data;
+    return request(this.api('/traffic'));
   }
 }