feat(api-detail): isCurrent + setCurrent + màj doc et seeder

- Shared types : ajout isCurrent sur ApiEntry et ApiEntryListItem
- Backend entity : colonne is_current (boolean, default true)
- Backend service : isCurrent calculé à la création, setCurrent()
  marque une version comme courante (siblings → false)
- Backend controller : POST /api/apis/:id/set-current
- Frontend ApiService : méthode setCurrent()
- Browse/upload : affichage badge "Courante" via isCurrent
- Seeder : données de démo mises à jour
- Documentation : api-reference, architecture, local-setup, CLAUDE.md

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

front-public/src/app/core/api.service.ts

@@ -49,6 +49,10 @@ export class ApiService {
     return this.http.get<ApiEntryListItem[]>(`${this.baseUrl}/${id}/versions`);
   }
 
+  setCurrent(id: string): Observable<ApiEntry> {
+    return this.http.post<ApiEntry>(`${this.baseUrl}/${id}/set-current`, {});
+  }
+
   regenerate(id: string): Observable<ApiEntry> {
     return this.http.post<ApiEntry>(`${this.baseUrl}/${id}/regenerate`, {});
   }