chore(project): 初始化项目基础配置文件

- 添加 CodeGraph、Android 和通用 gitignore 配置
- 创建项目元数据文件跟踪 Flutter 项目属性
- 添加 Codex AI 指导文档 AGENTS.md 说明项目架构
- 配置代码分析选项 analysis_options.yaml
- 设置 Android 应用清单权限和 Kiosk 模式配置
- 实现中英文国际化支持 AppLocalizations
- 配置 GoRouter 应用路由导航
- 创建明亮工业控制风格的主题配置 AppTheme

lib/features/settings/services/settings_service.dart

@@ -0,0 +1,63 @@
+import '../../../core/database/database_service.dart';
+
+/// 设置服务
+/// 管理系统设置（密码、语言偏好等）
+class SettingsService {
+  static final SettingsService instance = SettingsService._internal();
+  final DatabaseService _db = DatabaseService.instance;
+
+  SettingsService._internal();
+
+  /// 获取密码
+  Future<String> getPassword() async {
+    final database = await _db.database;
+    final results = await database.query(
+      'settings',
+      where: 'key = ?',
+      whereArgs: ['password'],
+    );
+    if (results.isEmpty) return '123456'; // 默认密码
+    return results.first['value'] as String;
+  }
+
+  /// 设置密码
+  Future<bool> setPassword(String newPassword) async {
+    final database = await _db.database;
+    final count = await database.update(
+      'settings',
+      {'value': newPassword},
+      where: 'key = ?',
+      whereArgs: ['password'],
+    );
+    return count > 0;
+  }
+
+  /// 验证密码
+  Future<bool> verifyPassword(String password) async {
+    final storedPassword = await getPassword();
+    return password == storedPassword;
+  }
+
+  /// 获取设置值
+  Future<String?> getSetting(String key) async {
+    final database = await _db.database;
+    final results = await database.query(
+      'settings',
+      where: 'key = ?',
+      whereArgs: [key],
+    );
+    if (results.isEmpty) return null;
+    return results.first['value'] as String;
+  }
+
+  /// 设置值
+  Future<bool> setSetting(String key, String value) async {
+    final database = await _db.database;
+    // 使用 insert 或 replace
+    await database.execute(
+      'INSERT OR REPLACE INTO settings (key, value) VALUES (?, ?)',
+      [key, value],
+    );
+    return true;
+  }
+}