refactor: rename BroadcastMessage model to ServerMessage

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pkg/models/server.go

@@ -0,0 +1,9 @@
+package models
+
+// ServerMessage represents the data sent to the client via WebSocket.
+type ServerMessage struct {
+	Mode       string `json:"mode"`        // "Work", "ShortBreak", or "LongBreak"
+	Session    int    `json:"session"`     // Current session number
+	MaxSession int    `json:"max_session"` // Total number of sessions
+	TimeLeft   int    `json:"time_left"`   // Remaining time in seconds
+}