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/rider/lib/controller/functions/add_error.dart

@@ -0,0 +1,19 @@
+import '../../constant/box_name.dart';
+import '../../constant/links.dart';
+import '../../main.dart';
+import 'crud.dart';
+
+addError(String error, where) async {
+  CRUD().post(link: AppLink.addError, payload: {
+    'error': error.toString(), // Example error description
+    'userId': box.read(BoxName.driverID) ??
+        box.read(BoxName.passengerID), // Example user ID
+    'userType': box.read(BoxName.driverID) != null
+        ? 'Driver'
+        : 'passenger', // Example user type
+    'phone': box.read(BoxName.phone) ??
+        box.read(BoxName.phoneDriver), // Example phone number
+
+    'device': where
+  });
+}