Realtime Socket.io + Express backend

• Finally added a backend to Codeliver! I’m using the WebSocket node library Socket.io to handle realtime events and messaging, so I had to set up an Express server to handle the different requests and events
• The backend also has to access the auth user data and the shared Prisma Postgres database, so it took me a while to make both the Next.js frontend and Express backend to be able to read and write to it properly (since they are technically their own repos)
• Also implemented Socket.io client to the Next.js frontend so whenever you send a message it either creates a new Chat object and sends the message or finds an existing one and adds a new message
• Added Prisma schema and frontend types for chats, messages, and reactions
• Added persistent message storing for each chat channel and removed the placeholder messages
• Figured out how to send a Better Auth JWT token from the frontend and verify the session on the backend to authorize messaging features
• I had to deal with a lot of annoying CORS, environment variable, and auth stuff, so that was not fun but the result was worth it