Refactor LlmService to delegate to LlmManagerService instead of using
Ollama directly. This enables multiple provider support and user-specific
provider configuration.
Changes:
- Remove direct Ollama client from LlmService
- Delegate all LLM operations to provider via LlmManagerService
- Update health status to use provider-agnostic interface
- Add PrismaModule to LlmModule for manager service
- Maintain backward compatibility with existing API
- Achieve 89.74% test coverage
Fixes#127
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>