refactor(openflare): migrate console APIs to v1 and centralize routing

Move OpenFlare management endpoints to /api/v1/custom/openflare with
Wavelet response envelopes and Abort* error handling. Keep agent, relay,
and flared protocol routes on /api/* with the legacy compat format.

- Add apiutil helpers and Swagger annotations for console handlers
- Register all OpenFlare routes in internal/router/openflare (not apps)
- Switch frontend services to OpenFlareBaseService and v1 paths
- Remove dead auth/compat code and legacy-base.service.ts
- Update integration tests and changelog

Wavelet/frontend/lib/services/openflare/about.service.ts

@@ -1,9 +1,7 @@
-import {LegacyOpenFlareBaseService} from './legacy-base.service';
-
-export class AboutService extends LegacyOpenFlareBaseService {
-  protected static override readonly basePath = '/api';
+import {OpenFlareBaseService} from './base.service';
 
+export class AboutService extends OpenFlareBaseService {
   static getAboutContent(): Promise<string> {
-    return this.legacyGet<string>('/about');
+    return this.get<string>('/about');
   }
 }