Add full OAuth provider functionality and enhance flows

- Implemented OAuth 2.0 Authorization Server endpoints per RFCs, including token, introspection, revocation, and metadata discovery.
- Added user consent submission, listing, and revocation APIs alongside frontend integration for improved UX.
- Enforced stricter OAuth security measures (PKCE, state validation, scopes).
- Refactored schemas and services for consistency and expanded coverage of OAuth workflows.
- Updated documentation and type definitions for new API behaviors.

frontend/src/mocks/handlers/generated.ts

@@ -8,7 +8,7 @@
  *
  * For custom handler behavior, use src/mocks/handlers/overrides.ts
  *
- * Generated: 2025-11-25T00:22:46.981Z
+ * Generated: 2025-11-26T12:21:51.098Z
  */
 
 import { http, HttpResponse, delay } from 'msw';