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/model/admin/monthly_ride.dart

@@ -0,0 +1,21 @@
+class MonthlyDataModel {
+  final int year;
+  final int month;
+  final int day;
+  final int ridesCount;
+
+  MonthlyDataModel({
+    required this.year,
+    required this.month,
+    required this.day,
+    required this.ridesCount,
+  });
+
+  factory MonthlyDataModel.fromJson(Map<String, dynamic> json) =>
+      MonthlyDataModel(
+        year: json['year'] as int,
+        month: json['month'] as int,
+        day: json['day'] as int,
+        ridesCount: json['rides_count'] as int,
+      );
+}