feat(account): 增加账号中心页面逻辑

lib/pages/account/account_deactivate_logic.dart

@@ -0,0 +1,85 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/foundation.dart';
+
+import '../../core/data/remote/api_client.dart';
+import '../../core/data/repositories/account_repository.dart';
+
+/// 注销申请与撤销状态。
+class AccountDeactivateLogic extends ChangeNotifier {
+  AccountDeactivateLogic(
+    this._repository, {
+    required this.clearSession,
+  });
+
+  static const maxReasonLength = 200;
+
+  final AccountRepository _repository;
+  final Future<void> Function() clearSession;
+  DateTime? scheduledAt;
+  bool requesting = false;
+  bool cancelling = false;
+  String? error;
+  String? actionMessage;
+  bool cancelSucceeded = false;
+  bool _disposed = false;
+
+  /// 申请注销；成功后立即清理本地会话。
+  Future<bool> request(String reason) async {
+    requesting = true;
+    error = null;
+    cancelSucceeded = false;
+    _notify();
+    try {
+      scheduledAt = await _repository.deactivate(
+        reason.trim().substring(
+          0,
+          reason.trim().length > maxReasonLength
+              ? maxReasonLength
+              : reason.trim().length,
+        ),
+      );
+      await clearSession();
+      return true;
+    } catch (failure) {
+      error = failure is ApiException
+          ? failure.message
+          : 'accountDeactivateFailed';
+      return false;
+    } finally {
+      requesting = false;
+      _notify();
+    }
+  }
+
+  /// 撤销待处理申请；失败时保留后端文案。
+  Future<bool> cancel() async {
+    cancelling = true;
+    actionMessage = null;
+    cancelSucceeded = false;
+    _notify();
+    try {
+      await _repository.cancelDeactivation();
+      cancelSucceeded = true;
+      return true;
+    } catch (failure) {
+      actionMessage = failure is ApiException
+          ? failure.message
+          : 'accountCancelFailed';
+      return false;
+    } finally {
+      cancelling = false;
+      _notify();
+    }
+  }
+
+  void _notify() {
+    if (!_disposed) notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    super.dispose();
+  }
+}

lib/pages/account/account_devices_logic.dart

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+// Author: fruit.com.cn
+
+import 'package:flutter/foundation.dart';
+
+import '../../core/data/models/account_device.dart';
+import '../../core/data/remote/api_client.dart';
+import '../../core/data/repositories/account_repository.dart';
+
+/// 只读登录设备列表状态。
+class AccountDevicesLogic extends ChangeNotifier {
+  AccountDevicesLogic(this._repository);
+
+  final AccountRepository _repository;
+  List<AccountDevice> devices = const [];
+  bool loading = false;
+  String? error;
+  bool _disposed = false;
+
+  /// 拉取当前账号的设备列表。
+  Future<void> load() async {
+    loading = true;
+    error = null;
+    _notify();
+    try {
+      devices = await _repository.devices();
+    } catch (failure) {
+      error = failure is ApiException
+          ? failure.message
+          : 'accountDevicesLoadFailed';
+    } finally {
+      loading = false;
+      _notify();
+    }
+  }
+
+  void _notify() {
+    if (!_disposed) notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    super.dispose();
+  }
+}

lib/pages/account/account_export_logic.dart

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+// Author: fruit.com.cn
+
+import 'package:flutter/foundation.dart';
+
+import '../../core/data/models/account_export.dart';
+import '../../core/data/remote/api_client.dart';
+import '../../core/data/repositories/account_repository.dart';
+
+/// 账号数据导出状态与复制动作。
+class AccountExportLogic extends ChangeNotifier {
+  AccountExportLogic(this._repository, {required this.copyText});
+
+  final AccountRepository _repository;
+  final Future<void> Function(String text) copyText;
+  AccountExport? data;
+  bool loading = false;
+  String? error;
+  bool _disposed = false;
+
+  /// 加载完整导出数据。
+  Future<void> load() async {
+    loading = true;
+    error = null;
+    _notify();
+    try {
+      data = await _repository.export();
+    } catch (failure) {
+      error = failure is ApiException
+          ? failure.message
+          : 'accountExportLoadFailed';
+    } finally {
+      loading = false;
+      _notify();
+    }
+  }
+
+  /// 把后端下发的完整 JSON 写入剪贴板。
+  Future<bool> copy() async {
+    final current = data;
+    if (current == null) return false;
+    await copyText(current.rawJson);
+    return true;
+  }
+
+  void _notify() {
+    if (!_disposed) notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    super.dispose();
+  }
+}

lib/pages/account/account_profile_logic.dart

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+// Author: fruit.com.cn
+
+import 'package:flutter/foundation.dart';
+
+import '../../core/data/models/account_profile.dart';
+import '../../core/data/remote/api_client.dart';
+import '../../core/data/repositories/account_repository.dart';
+
+/// 个人资料页状态与保存动作。
+class AccountProfileLogic extends ChangeNotifier {
+  AccountProfileLogic(this._repository, {required this.onProfileUpdated});
+
+  static const maxNicknameLength = 30;
+
+  final AccountRepository _repository;
+  final Future<void> Function(AccountProfile profile) onProfileUpdated;
+
+  AccountProfile? profile;
+  bool loading = false;
+  bool saving = false;
+  String? error;
+  String? fieldError;
+  bool _disposed = false;
+
+  /// 进入页面时加载当前资料。
+  Future<void> load() async {
+    loading = true;
+    error = null;
+    _notify();
+    try {
+      profile = await _repository.profile();
+    } catch (failure) {
+      error = _message(failure) ?? 'accountProfileLoadFailed';
+    } finally {
+      loading = false;
+      _notify();
+    }
+  }
+
+  /// 只提交本次改动；成功后同步登录态摘要。
+  Future<bool> save({
+    required String nickname,
+    required String gender,
+    String? birthday,
+  }) async {
+    final current = profile;
+    if (current == null) return false;
+    final trimmed = nickname.trim();
+    if (trimmed.isEmpty || trimmed.length > maxNicknameLength) {
+      fieldError = 'accountNicknameInvalid';
+      _notify();
+      return false;
+    }
+    final update = AccountProfileUpdate(
+      nickname: trimmed == current.nickname ? null : trimmed,
+      gender: gender.isEmpty || gender == current.gender ? null : gender,
+      birthday: birthday == null || birthday.isEmpty ? null : birthday,
+    );
+    if (update.toJson().isEmpty) return true;
+
+    saving = true;
+    error = null;
+    fieldError = null;
+    _notify();
+    try {
+      final next = await _repository.updateProfile(update);
+      profile = next;
+      await onProfileUpdated(next);
+      return true;
+    } catch (failure) {
+      error = _message(failure) ?? 'accountProfileSaveFailed';
+      return false;
+    } finally {
+      saving = false;
+      _notify();
+    }
+  }
+
+  String? _message(Object failure) =>
+      failure is ApiException ? failure.message : null;
+
+  void _notify() {
+    if (!_disposed) notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    super.dispose();
+  }
+}