feat: add QR code login and enhance chat experience

- Add QR code login flow with scanner and confirmation screens
- Implement swipe-to-reply in chat with SwipeableMessageBubble
- Replace FlatList with FlashList for chat performance optimization
- Add Schedule stack navigator with CourseDetail screen support
- Configure deep linking for QR code login (carrotbbs://qrcode/login/:sessionId)
- Update branding from 胡萝卜 to 萝卜社区
- Display dynamic app version in settings

src/services/authService.ts

@@ -432,5 +432,63 @@ class AuthService {
   }
 }
 
+// ── 二维码登录相关接口 ──
+
+export interface QRCodeSession {
+  session_id: string;
+  qrcode_url: string;
+  expires_in: number;
+  expires_at: number;
+}
+
+export interface ScanResponse {
+  user: {
+    id: string;
+    nickname: string;
+    avatar: string;
+  };
+}
+
+// 二维码登录 API（扩展 AuthService）
+export const qrcodeApi = {
+  /**
+   * 获取二维码
+   */
+  getQRCode: async (): Promise<QRCodeSession> => {
+    const response = await api.get<QRCodeSession>('/auth/qrcode');
+    return response.data;
+  },
+
+  /**
+   * 扫描二维码
+   */
+  scan: async (sessionId: string): Promise<ScanResponse> => {
+    const response = await api.post<ScanResponse>('/auth/qrcode/scan', {
+      session_id: sessionId,
+    });
+    return response.data;
+  },
+
+  /**
+   * 确认登录
+   */
+  confirm: async (sessionId: string): Promise<{ success: boolean }> => {
+    const response = await api.post<{ success: boolean }>('/auth/qrcode/confirm', {
+      session_id: sessionId,
+    });
+    return response.data;
+  },
+
+  /**
+   * 取消登录
+   */
+  cancel: async (sessionId: string): Promise<{ success: boolean }> => {
+    const response = await api.post<{ success: boolean }>('/auth/qrcode/cancel', {
+      session_id: sessionId,
+    });
+    return response.data;
+  },
+};
+
 // 导出认证服务实例
 export const authService = new AuthService();