Implement Google Navigation Flutter integration for turn-by-turn delivery navigation

Adds complete Google Navigation support with:
- LocationPermissionService for runtime location permissions
- NavigationSessionService for session and route management
- NavigationPage for full-screen turn-by-turn navigation UI
- NavigationTermsAndConditionsDialog for service acceptance
- Comprehensive i18n support (English/French)
- Android minSdk=23 with Java NIO desugaring
- iOS location permissions in Info.plist
- Error handling with user-friendly dialogs
- Location update and arrival notifications

Includes detailed setup guide and implementation documentation with API key
configuration instructions, integration examples, and testing checklist.

Generated with Claude Code

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

lib/l10n/app_en.arb

@@ -65,5 +65,23 @@
       "completed": {"type": "int"},
       "total": {"type": "int"}
     }
-  }
+  },
+  "navigationTcTitle": "Navigation Service",
+  "navigationTcDescription": "This app uses Google Navigation to provide turn-by-turn navigation for deliveries.",
+  "navigationTcAttribution": "Attribution: Maps and navigation services provided by Google Maps.",
+  "navigationTcTerms": "By accepting, you agree to Google's Terms of Service and Privacy Policy for Navigation services.",
+  "accept": "Accept",
+  "decline": "Decline",
+  "locationPermissionRequired": "Location Permission",
+  "locationPermissionMessage": "This app requires location permission to navigate to deliveries.",
+  "locationPermissionDenied": "Location permission denied. Navigation cannot proceed.",
+  "permissionPermanentlyDenied": "Permission Required",
+  "openSettingsMessage": "Location permission is permanently denied. Please enable it in app settings.",
+  "openSettings": "Open Settings",
+  "cancel": "Cancel",
+  "ok": "OK",
+  "requestPermission": "Request Permission",
+  "navigationArrived": "You have arrived at the destination",
+  "navigatingTo": "Navigating to",
+  "initializingNavigation": "Initializing navigation..."
 }