Updates .env.example with missing variables. Adds missing security headers in middleware. Fixes repository tests including timezone issues and sqlmock expectations.
- Add CORS_ORIGINS env var for multiple domains support
- Update config.go with CORSOrigins field and getEnvStringSlice helper
- Rewrite CORS middleware with CORSWithConfig for dynamic origins
- Update server.go to use configurable CORS
- Update .env.example with all configuration variables
- Optimize Dockerfile: switch to distroless image, update port to 8214
- Add GET / endpoint with SaveInMed API info
- Update PORT from 8080 to 8214 in .env.example
- Add start.sh interactive development script
- Script auto-installs dependencies when needed
