Add environment variable support to config.py with fallback defaults

[Copilot]

Summary

This PR converts hardcoded configuration values in config.py to environment variable-based configuration while maintaining full backward compatibility. Users can now override configuration values using environment variables for secure production deployments.

Changes Made

• Updated config.py to use os.environ.get() for all configuration values
• Added clear documentation comments specifying environment variable names
• Maintained the same variable names and structure for backward compatibility
• Provided all original hardcoded values as fallback defaults

Environment Variables Added

Variable	Default Value	Description
FRONTEND_HOST	http://localhost:3000	Frontend application host URL
DATABASE_URL	postgresql+psycopg://user:password@localhost:5432/binx	PostgreSQL connection string
ENDPOINT	b456c973fcfed7f5383ebbef9b82b425.r2.cloudflarestorage.com	S3-compatible storage endpoint
ACCESS_KEY	f962a8292930c0620a7a8166fe62f6cf	S3 access key
SECRET_KEY	cd2c90643a4f69992e4172eab295a707ea2e4d9c9b30a8283f32dea28faa4dbe	S3 secret key
BUCKET_NAME	binx	S3 bucket name
JWT_SECRET_KEY	your-secret-key	JWT signing secret key

Usage Examples

Development (no changes needed)

# Uses built-in defaults - existing workflow unchanged
uvicorn app:app --reload

Production deployment

export FRONTEND_HOST="https://your-domain.com"
export DATABASE_URL="postgresql+psycopg://prod_user:secure_pass@db.example.com:5432/binx_prod"
export JWT_SECRET_KEY="your-very-secure-jwt-secret"
# ... set other production values
uvicorn app:app --host 0.0.0.0 --port 8000

Docker deployment

ENV FRONTEND_HOST=https://your-domain.com
ENV DATABASE_URL=postgresql+psycopg://user:pass@db:5432/binx
ENV JWT_SECRET_KEY=your-jwt-secret
# ... other environment variables

Benefits

• Security: Sensitive values like keys can be kept out of source code
• Flexibility: Easy configuration for different deployment environments
• Backward Compatibility: Existing deployments continue to work unchanged
• DevOps Friendly: Standard environment variable pattern for configuration

Testing

• ✅ All modules import configuration values correctly
• ✅ Environment variables override defaults when set
• ✅ Fallback to defaults when environment variables are not set
• ✅ Backward compatibility maintained for existing imports
• ✅ Authentication and S3 functionality verified with new configuration

This change enables secure production deployments while maintaining the simplicity of the current development workflow.

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