feat(docker): Add Docker support for local development and automate

[Jorgelig]

• Added Dockerfile and Docker Compose configuration for local development (Dockerfile.dev).
• Implemented entrypoint scripts to manage PocketBase setup and Vite server startup.
• Automated the download and extraction of PocketBase within the Docker container.
• Configured .gitignore to prevent sensitive environment files from being tracked.
• Updated README with instructions for using Docker in development and production environments.