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.

app/lib/src/error_observer.dart

@@ -10,7 +10,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 ///
 /// ---------------------------------------------------------------------------
 /// 它是**兜底**，不是主路径：UI 该显示的错误由 `AsyncValueView` 负责，这里只
-/// 负责"这个异常有没有人处理过"之外的另一件事——落日志和上报。
+/// 负责"这个异常有没有人处理过"之外的另一件事——落日志。
 ///
 /// 三类要**主动排除**，否则线上告警会被噪音淹没：
 ///   - [BusinessException]：后端明确告诉我们"这个操作不允许"，是预期内的流程
@@ -20,14 +20,11 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 /// ---------------------------------------------------------------------------
 final class ErrorObserver extends ProviderObserver {
   /// 构造。
-  ErrorObserver({required this.logger, required this.reporter});
+  ErrorObserver({required this.logger});
 
   /// 日志出口。
   final AppLogger logger;
 
-  /// 崩溃上报出口。
-  final CrashReporter reporter;
-
   @override
   void providerDidFail(ProviderObserverContext context, Object error, StackTrace stackTrace) {
     final String name = context.provider.name ?? context.provider.runtimeType.toString();
@@ -42,6 +39,5 @@ final class ErrorObserver extends ProviderObserver {
     }
 
     logger.e('provider 失败 $name', error: error, stackTrace: stackTrace);
-    reporter.report(error, stackTrace, extra: <String, String>{'provider': name});
   }
 }