feat: Add local development support without Docker

[acwilan]

Changes

• Added LOCAL_DEV.md with comprehensive instructions for running the app without Docker
• Updated Makefile with local development commands (local-backend, local-frontend, local-migrate)
• Modified README.md to reference the new local development documentation
• Exposed MySQL port 3306 in docker-compose.yml to allow local connections
• Added proxy configuration to frontend/vite.config.ts to support API requests in local dev mode

Why

These changes make it easier for developers to run the application directly on their local machine without requiring Docker, which can be beneficial for:

• Faster development iterations
• Developers with limited system resources
• Environments where Docker setup is problematic
• Debugging certain issues that are difficult to troubleshoot in containers

The Docker-based workflow remains fully supported and unchanged.

[windsurf-bot]

Other comments (1)

• docker-compose.yml (18-19) Exposing the database port 3306 to the host machine is useful for local development, but could present a security risk if used in production environments. Consider adding a comment in the docker-compose.yml file indicating this is for development purposes only, or using environment variables to conditionally expose the port based on the environment.

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