fix: correct Traccar Client setup instructions

- Remove unreliable QR code scanning, add direct app store links
- Fix server URL to use HTTP (not HTTPS) for port 5055
- OsmAnd protocol doesn't use SSL
- Emphasize that official Traccar Client app is required

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

backend/src/gps/traccar-client.service.ts

@@ -343,7 +343,7 @@ export class TraccarClientService implements OnModuleInit {
 
   /**
    * Get the device port URL for mobile app configuration
-   * Returns hostname:port for Traccar Client app to connect to
+   * Returns full HTTP URL - port 5055 uses OsmAnd protocol without SSL
    */
   getDeviceServerUrl(): string {
     const port = this.configService.get<string>('TRACCAR_DEVICE_PORT') || '5055';
@@ -352,10 +352,10 @@ export class TraccarClientService implements OnModuleInit {
     const traccarUrl = this.getTraccarUrl();
     try {
       const url = new URL(traccarUrl);
-      // Return just hostname:port (no protocol - the app handles that)
-      return `${url.hostname}:${port}`;
+      // Return HTTP URL (not HTTPS) - OsmAnd protocol on port 5055 doesn't use SSL
+      return `http://${url.hostname}:${port}`;
     } catch {
-      return `localhost:${port}`;
+      return `http://localhost:${port}`;
     }
   }