feat(handlers): Add GetDevicesData helper and update devices template for SSR

- Add GetDevicesData() to DeviceHandler (returns raw data, not JSON)
- Update devices template signature to accept pre-rendered data
- Add server-side rendering of devices and pending registrations
- Update JavaScript to use location.reload() after CRUD operations
- Remove getDeviceIcon dependency on JavaScript function
- Use templ if/else instead of ternary operators for device status

Preserves all API endpoints and backward compatibility

internal/handlers/devices.go

@@ -272,6 +272,46 @@ func (h *DeviceHandler) ListDevices(c echo.Context) error {
 	})
 }
 
+func (h *DeviceHandler) GetDevicesData(c echo.Context) ([]DeviceInfo, error) {
+	userID := c.Get("user_id").(string)
+	userUUID, err := uuid.Parse(userID)
+	if err != nil {
+		return nil, err
+	}
+
+	pgUserID := pgtype.UUID{Bytes: [16]byte(userUUID), Valid: true}
+
+	devices, err := h.db.ListDevicesByUser(c.Request().Context(), pgUserID)
+	if err != nil {
+		return nil, err
+	}
+
+	deviceList := make([]DeviceInfo, 0, len(devices))
+	for _, device := range devices {
+		syncEnabled := device.SyncEnabled.Bool && device.SyncEnabled.Valid
+		autoSync := device.AutoSync.Bool && device.AutoSync.Valid
+		syncFreq := int32(0)
+		if device.SyncFrequencyMinutes.Valid {
+			syncFreq = device.SyncFrequencyMinutes.Int32
+		}
+
+		deviceList = append(deviceList, DeviceInfo{
+			ID:             device.ID.Bytes,
+			DeviceName:     device.DeviceName,
+			DeviceType:     device.DeviceType,
+			LastSync:       (*time.Time)(&device.LastSync.Time),
+			LastSeen:       (*time.Time)(&device.LastSeen.Time),
+			SyncEnabled:    syncEnabled,
+			AutoSync:       autoSync,
+			SyncFrequency:  syncFreq,
+			CreatedAt:      device.CreatedAt.Time,
+			DeviceMetadata: device.DeviceMetadata,
+		})
+	}
+
+	return deviceList, nil
+}
+
 func (h *DeviceHandler) GetDevice(c echo.Context) error {
 	userID := c.Get("user_id")
 	if userID == nil {