Replace direct provider linkage with group-based routing for Keys and
Providers. This allows for more flexible load balancing and tiering
strategies.
Changes include:
- Remove `ProviderID` from Key model and DTO
- Add `Group` field to Key and Provider models
- Refactor Redis sync to use Hashes for O(1) partial updates
- Update API handlers to perform incremental syncs
BREAKING CHANGE: Key API payload no longer accepts `provider_id`. Redis
configuration storage format has changed from JSON strings to Hashes.
Enable full resource management via API and support data plane
synchronization.
- Add CRUD handlers for Providers, Models, and Keys using DTOs
- Implement LogWriter service for asynchronous, batched audit logging
- Update SyncService to snapshot full configuration state to Redis
- Register new API routes and initialize background services
- Add configuration options for logging performance tuning