fix: link new devices to all admin users in Traccar

When creating a device, automatically link it to all Traccar admin users
so they can see it regardless of which account created the device.

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

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

@@ -180,12 +180,55 @@ export class TraccarClientService implements OnModuleInit {
    * Create a new device in Traccar
    */
   async createDevice(name: string, uniqueId: string, phone?: string): Promise<TraccarDevice> {
-    return this.request('post', '/api/devices', {
+    const device = await this.request<TraccarDevice>('post', '/api/devices', {
       name,
       uniqueId,
       phone,
       category: 'person',
     });
+
+    // Link device to all admin users so they can see it
+    await this.linkDeviceToAllAdmins(device.id);
+
+    return device;
+  }
+
+  /**
+   * Link a device to a specific user
+   */
+  async linkDeviceToUser(deviceId: number, userId: number): Promise<boolean> {
+    try {
+      await this.request('post', '/api/permissions', {
+        userId,
+        deviceId,
+      });
+      return true;
+    } catch (error: any) {
+      // 400 means permission already exists, which is fine
+      if (error.response?.status === 400) {
+        return true;
+      }
+      this.logger.warn(`Failed to link device ${deviceId} to user ${userId}: ${error.message}`);
+      return false;
+    }
+  }
+
+  /**
+   * Link a device to all admin users
+   */
+  async linkDeviceToAllAdmins(deviceId: number): Promise<void> {
+    try {
+      const users = await this.getAllUsers();
+      const admins = users.filter(u => u.administrator);
+
+      for (const admin of admins) {
+        await this.linkDeviceToUser(deviceId, admin.id);
+      }
+
+      this.logger.log(`Linked device ${deviceId} to ${admins.length} admin users`);
+    } catch (error: any) {
+      this.logger.warn(`Failed to link device to admins: ${error.message}`);
+    }
   }
 
   /**