chore: update Docker configuration and improve health check functionality

- Added Docker health check endpoint to the FastAPI application, returning a 200 status when the app is running.
- Updated Dockerfile to include curl for health checks and modified entrypoint script to exit on errors.
- Enhanced .dockerignore and .gitignore files to exclude coverage and test artifacts.
- Updated docker-compose.prod.yml to specify version.
- Added pytest-cov as a development dependency to improve test coverage reporting.

.gitignore

@@ -7,3 +7,9 @@ venv/
 data/
 *.db
 .cursor/
+# Test and coverage artifacts
+.coverage
+htmlcov/
+.pytest_cache/
+*.cover
+*.plan.md