refactor: remove CrashReporter and related logging components

- Removed CrashReporter interface and its implementation, SentryCrashReporter.
- Deleted log buffering functionality and associated LogBuffer class.
- Updated LoggerAppLogger to eliminate dependencies on removed components.
- Simplified logging structure to focus on AppLogger and sensitive data scrubbing.
- Adjusted AppEnv to remove Sentry-related configurations.
- Refactored tests to align with the new logging architecture.

docs/04-routing.md

@@ -37,7 +37,7 @@ final goRouterProvider = Provider<GoRouter>((ref) {
   final router = GoRouter(
     navigatorKey: rootNavigatorKey, // 全局 dialog / 顶层跳转需要它
     initialLocation: '/home',
-    observers: [NavigationObserver(ref.read(crashReporterProvider))], // 崩溃前的页面路径，见 13
+    observers: const [], // 路由观测由 app 层按需注入
     redirect: (context, state) {
       // read 不是 watch：这里只要当前值，订阅由下面的 listen 负责
       final auth = ref.read(authStateProvider);