refactor(frontend): final component split and comprehensive type safety fixes

- Completed modular refactoring of KeysView.vue and SettingsView.vue.
- Resolved remaining TypeScript errors in new components.
- Standardized prop types and event emitters for sub-components.
- Optimized bundle size by eliminating redundant template code and unused script variables.
- Verified system stability with final type checking.

frontend/src/i18n/locales/zh.ts

@@ -1611,21 +1611,6 @@ export default {
       deleteProxy: '删除代理',
       deleteConfirmMessage: "确定要删除代理 '{name}' 吗？",
       testProxy: '测试代理',
-      columns: {
-        name: '名称',
-        protocol: '协议',
-        address: '地址',
-        priority: '优先级',
-        status: '状态',
-        lastCheck: '最近检测',
-        actions: '操作'
-      },
-      protocols: {
-        http: 'HTTP',
-        https: 'HTTPS',
-        socks5: 'SOCKS5',
-        socks5h: 'SOCKS5H (服务端解析 DNS)'
-      },
       columns: {
         nameLabel: '名称',
         namePlaceholder: '请输入代理名称',