🐛 fix(proxy): 避免全局代理影响数据库连接

移除数据库和 Redis 连接对全局代理的隐式继承

保留连接自身代理与 HTTP 隧道配置并修正缓存释放链路

同步六种语言的代理作用域说明并增加回归测试

Fixes #347

frontend/src/i18n/globalProxyScope.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from 'vitest';
+
+import { catalogs } from './catalog';
+
+const expectedDatabaseBoundaries = {
+  'de-DE': {
+    description: 'Datenbankverbindungen verwenden nur ihre eigenen Proxy-Einstellungen',
+    scope: 'Datenbankverbindungen sind nicht betroffen',
+  },
+  'en-US': {
+    description: 'Database connections only use their own proxy settings',
+    scope: 'does not affect database connections',
+  },
+  'ja-JP': {
+    description: 'データベース接続では接続ごとのプロキシ設定のみを使用します',
+    scope: 'データベース接続には影響しません',
+  },
+  'ru-RU': {
+    description: 'Подключения к базе данных используют только собственные настройки прокси',
+    scope: 'не влияет на подключения к базе данных',
+  },
+  'zh-CN': {
+    description: '数据库连接仅使用连接自身的代理配置',
+    scope: '不影响数据库连接',
+  },
+  'zh-TW': {
+    description: '資料庫連線僅使用連線本身的代理設定',
+    scope: '不影響資料庫連線',
+  },
+} as const;
+
+describe('global proxy scope copy', () => {
+  it('makes the database proxy boundary explicit in every locale', () => {
+    for (const [language, expected] of Object.entries(expectedDatabaseBoundaries)) {
+      const catalog = catalogs[language as keyof typeof catalogs];
+
+      expect(catalog['app.proxy.description']).toContain(expected.description);
+      expect(catalog['app.proxy.scope_hint']).toContain(expected.scope);
+    }
+  });
+});