- add Gorilla handlers package for enhanced HTTP handling
- refactor HTTP server to use a new ServeMux for routing
- update ListenAndServe to utilize ProxyHeaders for better proxy support
- add RealIP field to client model
- use RealIP fild for connect/disconnect log output
- change Clients map to use net.Addr as the key type
- update `HandleConnection()` to store clients using LocalAddr
- modify `handleClientCommands()` to delete clients by LocalAddr
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- remove unused Mutex from `models.Client` struct
- remove lock from `HandleConnection()`
- replace websocket.Conn with models.Client in `handleClientCommands()`
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