chore: 初始化脚手架 — sunny_mochi 企业级 Flutter 模板

Core 基础设施：Flavor 三包体系、Drift+SQLCipher 加密数据库
7 拦截器 Dio 网络栈、CrashReporter 崩溃日志、Sealed Failure 错误体系
5 色板主题系统、Auth 认证骨架（Clean Architecture）、Dev Panel、Mock Adapter

通过验证：flutter analyze（0 errors）、flutter test（全绿）、staging APK 74.8MB

lib/core/router/routes.dart

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+import 'package:go_router/go_router.dart';
+import 'package:sunny_mochi/core/widgets/shell_scaffold.dart';
+import 'package:flutter/material.dart';
+import 'package:sunny_mochi/features/auth/presentation/pages/login_page.dart';
+import 'package:sunny_mochi/features/dev_panel/presentation/pages/dev_panel_page.dart';
+import 'package:sunny_mochi/features/error_report/presentation/error_report_page.dart';
+
+part 'routes.g.dart';
+
+// ── StatefulShellRoute（底部导航 2 Tab）─────────────────────────────────────
+
+@TypedStatefulShellRoute<ShellRouteData>(
+  branches: [
+    TypedStatefulShellBranch<HomeBranch>(
+      routes: [TypedGoRoute<HomeRoute>(path: '/home')],
+    ),
+    TypedStatefulShellBranch<MineBranch>(
+      routes: [TypedGoRoute<MineRoute>(path: '/mine')],
+    ),
+  ],
+)
+class ShellRouteData extends StatefulShellRouteData {
+  const ShellRouteData();
+
+  @override
+  Widget builder(
+    BuildContext context,
+    GoRouterState state,
+    StatefulNavigationShell shell,
+  ) =>
+      ShellScaffold(shell: shell);
+}
+
+class HomeBranch extends StatefulShellBranchData {
+  const HomeBranch();
+}
+
+class MineBranch extends StatefulShellBranchData {
+  const MineBranch();
+}
+
+// ── Shell 叶子路由（TODO: 业务项目替换为真实页面）───────────────────────────
+
+class HomeRoute extends GoRouteData with $HomeRoute {
+  const HomeRoute();
+
+  @override
+  Widget build(BuildContext context, GoRouterState state) => const Scaffold(
+        body: Center(child: Text('Home — TODO: Replace with HomePage')),
+      );
+}
+
+class MineRoute extends GoRouteData with $MineRoute {
+  const MineRoute();
+
+  @override
+  Widget build(BuildContext context, GoRouterState state) => const Scaffold(
+        body: Center(child: Text('Mine — TODO: Replace with MinePage')),
+      );
+}
+
+// ── 独立路由（Shell 之外）────────────────────────────────────────────────────
+
+@TypedGoRoute<LoginRoute>(path: '/login')
+class LoginRoute extends GoRouteData with $LoginRoute {
+  const LoginRoute();
+
+  @override
+  Widget build(BuildContext context, GoRouterState state) =>
+      const LoginPage();
+}
+
+@TypedGoRoute<DevPanelRoute>(path: '/dev')
+class DevPanelRoute extends GoRouteData with $DevPanelRoute {
+  const DevPanelRoute();
+
+  @override
+  Widget build(BuildContext context, GoRouterState state) =>
+      const DevPanelPage();
+}
+
+@TypedGoRoute<ErrorReportRoute>(path: '/error-report')
+class ErrorReportRoute extends GoRouteData with $ErrorReportRoute {
+  const ErrorReportRoute();
+
+  @override
+  Widget build(BuildContext context, GoRouterState state) =>
+      const ErrorReportPage();
+}