feat: Gemini AI (doc OCR + face match) + role-assignment endpoints

- GeminiService (integrations/gemini, @Global): extractDocument (OCR fields) + faceMatch; graceful if no GEMINI_API_KEY
- documents: face-match now real via Gemini; POST /admin/documents/:id/ocr extracts fields for CS auto-fill
- roles: PATCH /admin/users/:id/role (admin) + POST /platform/users/role (bootstrap via x-platform-secret)
- config: gemini + platform.secret; .env.example entries

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/driver/lib/models/overlay_service.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/services.dart';
+
+class OverlayMethodChannel {
+  // 1. تم تصحيح اسم القناة ليتطابق مع ملف MainActivity.kt [1]
+  static const _channel = MethodChannel('com.intaleq_driver/app_control');
+
+  static Future bringToForeground() async {
+    try {
+      // استدعاء الدالة المعرفة في الكوتلن [3]
+      await _channel.invokeMethod('bringToForeground');
+    } on PlatformException catch (e) {
+      print('Error bringing app to foreground: $e');
+    }
+  }
+}