refactor: 拆分主页与公共组件，扫码登录改走 WinHTTP

- 抽出 lib/core 的日期/JSON 工具，收敛各页重复解析
- 主页与音乐风险页拆成组件，风险功能共用一套运行框架
- 修复设置页作为主页页签保存时弹掉根路由导致的黑屏
- 登录对齐 Astral aimedb 协议：84 位二维码校验、签名与请求头修正，
  补 GlobalSign 中间证书；Windows 改用 WinHTTP 绕过服务端对
  BoringSSL 的 TLS 指纹拦截（证书校验保持开启）
- 补开发预览数据与测试

lib/dev/ui_preview_data.dart

@@ -0,0 +1,114 @@
+import '../models/session_model.dart';
+import '../models/user_data.dart';
+import '../models/user_preview.dart';
+import '../services/title_api_service.dart';
+
+/// 开发期 UI 预览用的假数据，不连 aimedb / title server。
+///
+/// 改这里就能调主页各卡片展示的数值；头像 `iconId: 0` 显示占位图标，
+/// 改成非 0 会去 assets2.lxns.net 拉真实头像。
+const int uiPreviewUserId = 12345678901234;
+const String uiPreviewToken = 'ui-preview-token';
+const int uiPreviewLoginId = 987654;
+
+const UserDataBean uiPreviewUserData = UserDataBean(
+  userId: uiPreviewUserId,
+  userName: 'Ichino',
+  friendCode: '123456789012345',
+  isNetMember: true,
+  point: 234567,
+  totalPoint: 9876543,
+  playerRating: 15234,
+  playerOldRating: 8200,
+  playerNewRating: 7034,
+  highestRating: 15456,
+  musicRating: 13800,
+  gradeRank: 12,
+  courseRank: 34,
+  classRank: 56,
+  nameplateId: 101,
+  frameId: 202,
+  iconId: 0,
+  trophyId: 303,
+  plateId: 404,
+  titleId: 505,
+  partnerId: 606,
+  playCount: 2345,
+  currentPlayCount: 123,
+  totalSync: 45678,
+  totalAchievement: 123456,
+  totalDeluxscore: 98765,
+  totalAwake: 5678,
+  lastGameId: 'SDEZ',
+  lastRomVersion: '1.60.00',
+  lastDataVersion: '1.60.00',
+  lastLoginDate: '2026-10-25 12:34:56',
+  lastPlayDate: '2026-10-25 12:00:00',
+  firstGameId: 'SDEZ',
+  firstRomVersion: '1.00.00',
+  firstDataVersion: '1.00.00',
+  firstPlayDate: '2021-07-01 10:00:00',
+  lastRegionName: '上海',
+  lastRegionId: 1007,
+  dailyBonusDate: '2026-10-25 12:00:00',
+  banState: 0,
+);
+
+const UserPreviewDataBean uiPreviewPreview = UserPreviewDataBean(
+  userId: uiPreviewUserId,
+  userName: 'Ichino',
+  isLogin: true,
+  loginId: uiPreviewLoginId,
+  lastGameId: 'SDEZ',
+  lastRomVersion: '1.60.00',
+  lastDataVersion: '1.60.00',
+  lastLoginDate: '2026-10-25 12:34:56',
+  lastPlayDate: '2026-10-25 12:00:00',
+  playerRating: 15234,
+  nameplateId: 101,
+  iconId: 0,
+  trophyId: 303,
+  isNetMember: true,
+  isInherit: false,
+  totalAwake: 5678,
+  dispRate: 1,
+  dailyBonusDate: '2026-10-25 12:00:00',
+  headPhoneVolume: 80,
+  banState: 0,
+  errorId: 0,
+);
+
+const String uiPreviewRawResponse = '''
+{
+  "userId": $uiPreviewUserId,
+  "userName": "Ichino",
+  "isLogin": true,
+  "playerRating": 15234,
+  "banState": 0,
+  "errorId": 0
+}''';
+
+/// 预置登录态与主页种子数据；风险/票据页会按「已登录」渲染。
+SessionRestoreResult createUiPreviewSession() {
+  final now = DateTime.now().millisecondsSinceEpoch ~/ 1000;
+
+  SessionModel.instance
+    ..setGameLogin(
+      UserLoginResult(
+        token: uiPreviewToken,
+        loginId: uiPreviewLoginId,
+        lastLoginDate: uiPreviewUserData.lastLoginDate,
+        // 提前两分钟，避免页面一进来就卡在 60 秒登录冷却里。
+        loginDateTime: now - 120,
+      ),
+    )
+    ..updateCookies('JSESSIONID=UI-PREVIEW');
+
+  return const SessionRestoreResult(
+    reusedCookie: true,
+    userData: uiPreviewUserData,
+    preview: uiPreviewPreview,
+    rawPreviewResponse: uiPreviewRawResponse,
+    loggedIn: true,
+  );
+}

lib/dev/ui_preview_main.dart

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+import 'package:flutter/material.dart';
+
+import '../main.dart';
+import '../pages/home_page.dart';
+import 'ui_preview_data.dart';
+
+/// 开发期 UI 预览入口：跳过二维码登录，直接用假数据进主页。
+///
+/// flutter run -d windows -t lib/dev/ui_preview_main.dart --no-pub
+void main() {
+  WidgetsFlutterBinding.ensureInitialized();
+  final restored = createUiPreviewSession();
+  runApp(
+    MyApp(
+      home: HomePage(
+        userId: uiPreviewUserId,
+        token: uiPreviewToken,
+        restored: restored,
+      ),
+    ),
+  );
+}