Dockerize the Application with PostgreSQL Support

[Ranjan-n]

Description:

I would like to contribute by Dockerizing the project and setting up PostgreSQL to run locally via Docker Compose. This will help streamline development workflows and ensure consistent environments across different systems.

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Proposed Work:

• Create Dockerfile for both the frontend (Next.js) and backend (Express + Socket.IO)
• Add .dockerignore files for both services
• Set up PostgreSQL using docker-compose.yml
• Update README.md with Docker and Docker Compose setup instructions

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I am participating in GSSoC 2025. Kindly assign this issue to me so I can begin working on it.

[cloud-merge]

@Ranjan-n update?