docs: Clarify deviceId is BYOD-only in documentation

app/src/main/java/ink/trmnl/android/data/TrmnlDeviceConfigDataStore.kt

@@ -383,7 +383,9 @@ class TrmnlDeviceConfigDataStore
         }
 
         /**
-         * Saves the device ID (TRMNL device ID from /api/devices/me)
+         * Saves the device ID (TRMNL device ID from /api/devices/me).
+         *
+         * **Note:** This is only applicable for BYOD device types.
          */
         suspend fun saveDeviceId(deviceId: Int) {
             Timber.tag(TAG).d("Saving device ID: $deviceId")
@@ -394,7 +396,9 @@ class TrmnlDeviceConfigDataStore
         }
 
         /**
-         * Gets the device ID
+         * Gets the device ID.
+         *
+         * **Note:** This is only applicable for BYOD device types.
          */
         suspend fun getDeviceId(): Int? {
             val deviceId =

app/src/main/java/ink/trmnl/android/model/TrmnlDeviceConfig.kt

@@ -46,6 +46,8 @@ data class TrmnlDeviceConfig constructor(
      *
      * This ID is fetched during BYOD device validation and is required for
      * reporting battery status and other device-specific updates.
+     *
+     * **Note:** This field is only applicable for BYOD device types.
      */
     val deviceId: Int? = null,
 )