fix: e2e 类型声明 + ESLint 覆盖 e2e + backup 路径校验 + DX 脚本

- e2e/global.d.ts: Window.__TAURI_INTERNALS__ 类型声明
- e2e search-clean: 未使用参数 _args 前缀
- tsconfig.test.json: include e2e/
- CI: ESLint 扫描范围扩展到 e2e/
- backup_registry: 拒绝写入系统目录 (C:\Windows\, C:\Program Files\)
- package.json: 新增 lint:fix / format 脚本

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

e2e/tests/search-clean.spec.ts

@@ -3,8 +3,7 @@ import { test, expect } from '@playwright/test';
 test.beforeEach(async ({ page }) => {
   await page.addInitScript(() => {
     window.__TAURI_INTERNALS__ = {
-      // eslint-disable-next-line @typescript-eslint/no-unused-vars
-      invoke: async (cmd, args) => {
+      invoke: async (cmd, _args) => {
         switch (cmd) {
           case 'check_admin': return true;
           case 'load_system_paths': return ['C:\\\\Windows', 'invalid_path', 'C:\\\\Temp'];