chore: 移除 ultrareview preflight stub 及其测试

- 删除 src/services/api/ultrareviewPreflight.ts（自动生成的 stub）
- 删除 src/commands/review/UltrareviewPreflightDialog.tsx（依赖前者的 UI stub）
- 删除 src/services/api/__tests__/ultrareviewPreflight.test.ts（测试已删代码）
- 同步移除 ultrareviewCommand.test.tsx 中对 UltrareviewPreflightDialog 的 mock

Co-Authored-By: glm-5.2 <zai-org@claude-code-best.win>

src/commands/review/__tests__/ultrareviewCommand.test.tsx

@@ -179,13 +179,10 @@ mock.module('src/components/CustomSelect/select.js', () => ({
   Select: 'Select',
 }));
 
-// UltrareviewOverageDialog and PreflightDialog — return a simple marker
+// UltrareviewOverageDialog — return a simple marker
 mock.module('src/commands/review/UltrareviewOverageDialog.js', () => ({
   UltrareviewOverageDialog: () => ({ type: 'UltrareviewOverageDialog' }),
 }));
-mock.module('src/commands/review/UltrareviewPreflightDialog.js', () => ({
-  UltrareviewPreflightDialog: () => ({ type: 'UltrareviewPreflightDialog' }),
-}));
 
 import { call } from '../ultrareviewCommand.js';