- refactor client handling and message broadcasting
- replace Client struct
- implement SendMessage method in Client struct for safer message sending
- update client map to use *models.Client instead of bool
- adjust BroadcastMessage and RunPomodoroTimer functions to use new client type
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- move server logic to cmd/server/main.go
- create packages for websocket, pomodoro and broadcast handling
- define models for messages
- remove old GoTomato.go file
- update README
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