fix: sanitize device identifier and explicitly enable device

- Lowercase and strip non-alphanumeric chars from device ID
- Explicitly set disabled=false when creating device in Traccar
- Use the uniqueId returned by Traccar (ensures consistency)
- Add logging for debugging device creation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/gps/gps.service.ts

@@ -162,8 +162,10 @@ export class GpsService implements OnModuleInit {
       throw new BadRequestException('Driver is already enrolled for GPS tracking');
     }
 
-    // Generate unique device identifier (no special characters for better compatibility)
-    const deviceIdentifier = `vipdriver${driverId.replace(/-/g, '').slice(0, 8)}`;
+    // Generate unique device identifier (lowercase alphanumeric only for compatibility)
+    const deviceIdentifier = `vipdriver${driverId.replace(/-/g, '').slice(0, 8)}`.toLowerCase();
+
+    this.logger.log(`Enrolling driver ${driver.name} with device identifier: ${deviceIdentifier}`);
 
     // Create device in Traccar
     const traccarDevice = await this.traccarClient.createDevice(
@@ -172,12 +174,16 @@ export class GpsService implements OnModuleInit {
       driver.phone || undefined,
     );
 
+    // Use the uniqueId returned by Traccar (in case it was modified)
+    const actualDeviceId = traccarDevice.uniqueId;
+    this.logger.log(`Traccar returned device with uniqueId: ${actualDeviceId}`);
+
     // Create GPS device record (consent pre-approved by HR at hiring)
     await this.prisma.gpsDevice.create({
       data: {
         driverId,
         traccarDeviceId: traccarDevice.id,
-        deviceIdentifier,
+        deviceIdentifier: actualDeviceId, // Use what Traccar actually stored
         consentGiven: true,
         consentGivenAt: new Date(),
       },
@@ -194,7 +200,7 @@ GPS Tracking Setup Instructions for ${driver.name}:
    - Android: https://play.google.com/store/apps/details?id=org.traccar.client
 
 2. Open the app and configure:
-   - Device identifier: ${deviceIdentifier}
+   - Device identifier: ${actualDeviceId}
    - Server URL: ${serverUrl}
    - Frequency: ${settings.updateIntervalSeconds} seconds
    - Location accuracy: High
@@ -226,7 +232,7 @@ Note: GPS tracking is only active during shift hours (${settings.shiftStartHour}
 
     return {
       success: true,
-      deviceIdentifier,
+      deviceIdentifier: actualDeviceId, // Return what Traccar actually stored
       serverUrl,
       instructions,
       signalMessageSent,