Add complete CRUD functionality for bit-rate management following the same pattern as bit-depth:
- Create BitRate entity model with JPA annotations
- Implement BitRateRepository with full CRUD operations
- Add BitRateService with validation and business logic
- Create BitRateMapper for protobuf/entity conversion
- Implement action handlers: Create, GetAll, GetById, Update, Delete
- Define bitrate.proto protobuf message definitions
- Register BitRateService in DelegateActionManager
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Co-Authored-By: Claude <noreply@anthropic.com>
Gustavo Henrique Santos Souza de Miranda