feat(web): 分类展示公开 API 文档

将通用开放接口与兼容接口分层展示，补充完整接口目录、分类路由、搜索能力和接入约定。\n\n验证：pnpm nx run web:test；pnpm nx run web:build

apps/web/src/routing.test.ts

@@ -3,6 +3,12 @@ import { parseAppRoute, pathForApiDocSection } from './routing';
 
 describe('API documentation routes', () => {
   it.each([
+    ['openApiOverview', '/docs/open-api'],
+    ['compatApiOverview', '/docs/compatible-api'],
+    ['compatGemini', '/docs/compatible-api/gemini'],
+    ['compatKling', '/docs/compatible-api/kling'],
+    ['compatVolces', '/docs/compatible-api/volces'],
+    ['compatServerMain', '/docs/compatible-api/server-main'],
     ['guideBaseUrl', '/docs/auth'],
     ['guideWebhook', '/docs/webhook'],
     ['guideErrors', '/docs/errors'],
@@ -24,4 +30,8 @@ describe('API documentation routes', () => {
   ] as const)('keeps the legacy documentation URL %s working', (path, section) => {
     expect(parseAppRoute(path).apiDocSection).toBe(section);
   });
+
+  it('uses the common open API catalog as the documentation landing page', () => {
+    expect(parseAppRoute('/docs').apiDocSection).toBe('openApiOverview');
+  });
 });