feat: integrate Firebase Analytics, add Google Maps dependencies, and expose new GA4 metric API endpoints.

lib/services/analytics_service.dart

@@ -0,0 +1,54 @@
+import 'package:firebase_analytics/firebase_analytics.dart';
+import 'package:flutter/foundation.dart';
+
+/// Service wrapper for Google Analytics
+class AnalyticsService {
+  final FirebaseAnalytics _analytics = FirebaseAnalytics.instance;
+
+  FirebaseAnalyticsObserver getAnalyticsObserver() =>
+      FirebaseAnalyticsObserver(analytics: _analytics);
+
+  Future<void> logEvent({
+    required String name,
+    Map<String, Object>? parameters,
+  }) async {
+    try {
+      await _analytics.logEvent(name: name, parameters: parameters);
+    } catch (e) {
+      debugPrint('Error logging analytics event: $e');
+    }
+  }
+
+  Future<void> setUserProperty({
+    required String name,
+    required String? value,
+  }) async {
+    try {
+      await _analytics.setUserProperty(name: name, value: value);
+    } catch (e) {
+      debugPrint('Error setting user property: $e');
+    }
+  }
+
+  Future<void> setUserId(String? id) async {
+    try {
+      await _analytics.setUserId(id: id);
+    } catch (e) {
+      debugPrint('Error setting user ID: $e');
+    }
+  }
+
+  Future<void> logScreenView({
+    required String screenName,
+    String? screenClass,
+  }) async {
+    try {
+      await _analytics.logScreenView(
+        screenName: screenName,
+        screenClass: screenClass,
+      );
+    } catch (e) {
+      debugPrint('Error logging screen view: $e');
+    }
+  }
+}