Implement dependency injection patterns for testable and modular code.
Implement dependency injection for: [DESCRIBE YOUR APPLICATION] Components to inject: - [ ] Database connections - [ ] API clients - [ ] Configuration - [ ] Logging - [ ] Cache - [ ] Custom services: [LIST] Framework: [FASTAPI/FLASK/STANDALONE] Provide: 1. Manual dependency injection 2. FastAPI Depends pattern 3. dependency-injector library 4. Constructor injection 5. Method injection 6. Interface/Protocol definitions 7. Scoped dependencies 8. Lazy initialization 9. Testing with mocks 10. Factory patterns 11. Container configuration 12. Common pitfalls
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[DESCRIBE YOUR APPLICATION][LIST]