fix: restore token-based Traccar auto-login

Reverted Auth0-only approach since Traccar has openid.force=false
and the token-based login was working.

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

backend/src/gps/gps.service.ts

@@ -685,8 +685,7 @@ Note: GPS tracking is only active during shift hours (${settings.shiftStartHour}
   }
 
   /**
-   * Get Traccar admin URL (Auth0 SSO handles authentication)
-   * User's Auth0 role determines admin status in Traccar
+   * Get auto-login URL for Traccar (for admin users)
    */
   async getTraccarAutoLoginUrl(user: User): Promise<{
     url: string;
@@ -696,29 +695,36 @@ Note: GPS tracking is only active during shift hours (${settings.shiftStartHour}
       throw new BadRequestException('Only administrators can access Traccar admin');
     }
 
-    // Just return the Traccar URL - Auth0 SSO handles authentication
-    // User must have ADMINISTRATOR role in Auth0 to get admin access in Traccar
+    // Ensure user is synced to Traccar (this also sets up their token)
+    await this.syncUserToTraccar(user);
+
+    // Get the token for auto-login
+    const token = this.generateTraccarToken(user.id);
     const baseUrl = this.traccarClient.getTraccarUrl();
 
+    // Return URL with token parameter for auto-login
+    // Traccar supports ?token=xxx for direct authentication
     return {
-      url: baseUrl,
+      url: `${baseUrl}?token=${token}`,
       directAccess: true,
     };
   }
 
   /**
    * Get Traccar session cookie for a user (for proxy/iframe auth)
-   * Note: With Auth0 SSO (openid.force=true), this won't work.
-   * Use getTraccarAutoLoginUrl() instead for direct redirect.
    */
   async getTraccarSessionForUser(user: User): Promise<string | null> {
     if (user.role !== 'ADMINISTRATOR') {
       return null;
     }
 
-    // With Auth0 SSO, session creation via password is disabled
-    // Return null to indicate direct access via URL is needed
-    return null;
+    // Ensure user is synced
+    await this.syncUserToTraccar(user);
+
+    const password = this.generateTraccarPassword(user.id);
+    const session = await this.traccarClient.createUserSession(user.email, password);
+
+    return session?.cookie || null;
   }
 
   /**