Fix WebSocket XML tag issue by removing unused WebSocketMessage struct

The WebSocketMessage struct was causing a lint error due to invalid xml:",any" tag.
Investigation revealed this struct was unused in actual WebSocket parsing - the
ParseWebSocketEvent() function works directly with WebSocketEvent struct.

Changes:
- Removed unused WebSocketMessage struct and its GetEventType() method
- Removed corresponding tests
- WebSocket functionality verified working (all tests pass)
- Actual parsing uses WebSocketEvent which has proper XML tags

This resolves the SA5008 lint warning while maintaining full WebSocket functionality.

pkg/models/websocket.go

@@ -77,45 +77,6 @@ type WebSocketEvent struct {
 	Timestamp              time.Time                    `json:"timestamp"` // Added by client for tracking
 }
 
-// WebSocketMessage represents a single event message within the updates
-type WebSocketMessage struct {
-	XMLName   xml.Name           `json:"-"`
-	EventType WebSocketEventType `json:"eventType"`
-	Content   interface{}        `json:"content"`
-}
-
-// GetEventType returns the event type based on the XML element name
-func (m *WebSocketMessage) GetEventType() WebSocketEventType {
-	switch m.XMLName.Local {
-	case "nowPlayingUpdated":
-		return EventTypeNowPlaying
-	case "volumeUpdated":
-		return EventTypeVolumeUpdated
-	case "connectionStateUpdated":
-		return EventTypeConnectionState
-	case "presetUpdated":
-		return EventTypePresetUpdated
-	case "zoneUpdated":
-		return EventTypeZoneUpdated
-	case "bassUpdated":
-		return EventTypeBassUpdated
-	case "clockTimeUpdated":
-		return EventTypeClockTimeUpdated
-	case "clockDisplayUpdated":
-		return EventTypeClockDisplayUpdated
-	case "nameUpdated":
-		return EventTypeNameUpdated
-	case "errorUpdated":
-		return EventTypeErrorUpdated
-	case "recentsUpdated":
-		return EventTypeRecentsUpdated
-	case "languageUpdated":
-		return EventTypeLanguageUpdated
-	default:
-		return EventTypeUnknown
-	}
-}
-
 // GetEvents returns all events present in this WebSocket event
 func (e *WebSocketEvent) GetEvents() []interface{} {
 	var events []interface{}

pkg/models/websocket_test.go

@@ -1,7 +1,6 @@
 package models
 
 import (
-	"encoding/xml"
 	"testing"
 	"time"
 )
@@ -38,38 +37,6 @@ func TestWebSocketEventType_String(t *testing.T) {
 	}
 }
 
-func TestWebSocketMessage_GetEventType(t *testing.T) {
-	tests := []struct {
-		name     string
-		xmlName  xml.Name
-		expected WebSocketEventType
-	}{
-		{"NowPlaying", xml.Name{Local: "nowPlayingUpdated"}, EventTypeNowPlaying},
-		{"VolumeUpdated", xml.Name{Local: "volumeUpdated"}, EventTypeVolumeUpdated},
-		{"ConnectionState", xml.Name{Local: "connectionStateUpdated"}, EventTypeConnectionState},
-		{"PresetUpdated", xml.Name{Local: "presetUpdated"}, EventTypePresetUpdated},
-		{"ZoneUpdated", xml.Name{Local: "zoneUpdated"}, EventTypeZoneUpdated},
-		{"BassUpdated", xml.Name{Local: "bassUpdated"}, EventTypeBassUpdated},
-		{"ClockTimeUpdated", xml.Name{Local: "clockTimeUpdated"}, EventTypeClockTimeUpdated},
-		{"ClockDisplayUpdated", xml.Name{Local: "clockDisplayUpdated"}, EventTypeClockDisplayUpdated},
-		{"NameUpdated", xml.Name{Local: "nameUpdated"}, EventTypeNameUpdated},
-		{"ErrorUpdated", xml.Name{Local: "errorUpdated"}, EventTypeErrorUpdated},
-		{"RecentsUpdated", xml.Name{Local: "recentsUpdated"}, EventTypeRecentsUpdated},
-		{"LanguageUpdated", xml.Name{Local: "languageUpdated"}, EventTypeLanguageUpdated},
-		{"Unknown", xml.Name{Local: "unknownEvent"}, EventTypeUnknown},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			msg := WebSocketMessage{XMLName: tt.xmlName}
-			result := msg.GetEventType()
-			if result != tt.expected {
-				t.Errorf("WebSocketMessage.GetEventType() = %v, want %v", result, tt.expected)
-			}
-		})
-	}
-}
-
 func TestConnectionState_IsConnected(t *testing.T) {
 	tests := []struct {
 		name     string