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/models/model/driver/rides_summary_model.dart

@@ -0,0 +1,12 @@
+class MonthlyDataModel {
+  int day;
+  int totalDuration;
+
+  MonthlyDataModel({required this.day, required this.totalDuration});
+
+  factory MonthlyDataModel.fromJson(Map<String, dynamic> json) =>
+      MonthlyDataModel(
+          day: int.parse(json['day'].toString().split('-')[2]),
+          totalDuration:
+              int.parse(json['total_duration'].toString().split(':')[0]));
+}