Add full implementation for Disc entity following existing patterns:
- Create Disc model with Album relationship
- Add DiscRepository for data persistence
- Implement DiscService with business logic
- Create DiscMapper for protobuf conversion
- Add all handler classes (Create, Get, GetById, Update, Delete)
- Register DiscService in DelegateActionManager
- Define disc.proto with all message types
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Gustavo Henrique Santos Souza de Miranda