Heartbeats on backend!

so the lilbros (agents) will send heartbeats every few minutes and to handle that i first made a /register endpoint where the agents will first register and then start sending hearbeats but then thought that agents will also restart and i will have to treat their registration attempt as heartbeat, so there a thin line between /register and /heartbeat so i just merged them into /heartbeat lol

so now agent generates a UUID locally and sends it along side other metadata about the system to backend, and backend checks if the agent exists then it just updates the last_seen in database and other metadata and if it doesnt then it creates a new agent, simple as hell

again, dont have much to show right now as no UI lol