Reflect recent API changes in Swagger documentation:
- Add endpoints for feature flag management (/admin/features)
- Add endpoint for issuing child keys to masters (/admin/masters/{id}/keys)
- Add endpoint for updating providers (/admin/providers/{id})
- Update provider model definitions with new fields (auto_ban, google_* attributes, status)
- Added Swagger documentation for the following admin endpoints:
- Create a new master tenant
- Create a new provider
- Register a new model
- List all models
- Update a model
- Force sync snapshot
- Ingest logs
- Added Swagger documentation for the master endpoint:
- Issue a child key
- Updated go.mod and go.sum to include necessary dependencies for Swagger.