feat: 接入起卦后端流程并完善积分扣减链路

apps/lib/app/app.dart

@@ -9,6 +9,7 @@ import '../features/auth/data/repositories/auth_repository.dart';
 import '../features/auth/presentation/bloc/auth_bloc.dart';
 import '../features/auth/presentation/bloc/auth_state.dart';
 import '../features/auth/presentation/screens/login_screen.dart';
+import '../features/divination/data/apis/divination_api.dart';
 import '../features/home/presentation/screens/home_screen.dart';
 import '../features/settings/data/models/profile_settings.dart';
 import '../l10n/app_localizations.dart';
@@ -26,10 +27,14 @@ class EryaoApp extends StatefulWidget {
 class _EryaoAppState extends State<EryaoApp> {
   final SessionStore _sessionStore = SessionStore(LocalKvStore());
   late final AuthBloc _authBloc;
+  late final DivinationApi _divinationApi;
   Locale _locale = const Locale('zh');
   ProfileSettingsV1 _profileSettings = ProfileSettingsV1.defaultsForLocale(
     const Locale('zh'),
   );
+  int _creditsBalance = 0;
+  bool _loadingCredits = false;
+  String? _loadedCreditsUserEmail;
 
   @override
   void initState() {
@@ -42,6 +47,7 @@ class _EryaoAppState extends State<EryaoApp> {
       },
     );
     final authApi = AuthApi(apiClient: apiClient);
+    _divinationApi = DivinationApi(apiClient: apiClient);
     final authRepository = AuthRepositoryImpl(
       authApi: authApi,
       sessionStore: _sessionStore,
@@ -50,6 +56,30 @@ class _EryaoAppState extends State<EryaoApp> {
     _bootstrap();
   }
 
+  void _ensureCreditsLoaded(String userEmail) {
+    if (_loadingCredits) {
+      return;
+    }
+    if (_loadedCreditsUserEmail == userEmail) {
+      return;
+    }
+    _loadingCredits = true;
+    _divinationApi
+        .getPointsBalance()
+        .then((balance) {
+          if (!mounted) {
+            return;
+          }
+          setState(() {
+            _creditsBalance = balance.availableBalance;
+            _loadedCreditsUserEmail = userEmail;
+          });
+        })
+        .whenComplete(() {
+          _loadingCredits = false;
+        });
+  }
+
   @override
   void dispose() {
     _authBloc.dispose();
@@ -118,12 +148,13 @@ class _EryaoAppState extends State<EryaoApp> {
     }
 
     if (state.status == AuthStatus.authenticated && state.user != null) {
+      _ensureCreditsLoaded(state.user!.email);
       return HomeScreen(
         account: state.user!.email,
         sessionStore: _sessionStore,
         currentLocale: _locale,
         profileSettings: _profileSettings,
-        coinBalance: 100,
+        coinBalance: _creditsBalance,
         onLocaleChanged: _handleInterfaceLanguageChanged,
         onLogout: _authBloc.logout,
       );