Add Android support with configurable server URL and location permissions

- Add shared_preferences for persisting server URL
- Add SettingsService and PlatformService
- Add server URL input field on non-web platforms
- Make ApiConfig baseUrl configurable at runtime
- Add Android location permissions (ACCESS_FINE/COURSE_LOCATION, INTERNET)
- Request location permission on login and map init
- Fix geo_id type: use String instead of int (UUID format)
- Align share_service with API spec: remove unique_id, use share_id only
- Fix watch endpoint response: last_update instead of created_at
- Add error handling with SnackBars for geo operations
- Wrap login screen in SingleChildScrollView for keyboard handling
- Update map tile layer with userAgentPackageName for OSM

lib/screens/map_screen.dart

@@ -43,6 +43,17 @@ class _MapScreenState extends State<MapScreen> {
         return;
       }
 
+      final status = await Geolocator.checkPermission();
+      if (status == LocationPermission.denied) {
+        final requested = await Geolocator.requestPermission();
+        if (requested == LocationPermission.denied) {
+          return;
+        }
+      }
+      if (status == LocationPermission.deniedForever) {
+        return;
+      }
+
       final position = await Geolocator.getCurrentPosition();
       setState(() {
         _center = LatLng(position.latitude, position.longitude);
@@ -54,11 +65,18 @@ class _MapScreenState extends State<MapScreen> {
       final shareProvider = context.read<ShareProvider>();
 
       if (authProvider.token.isNotEmpty) {
-        await shareProvider.createShare(
-          authProvider.token,
-          position.longitude,
-          position.latitude,
-        );
+        try {
+          await shareProvider.createShare(
+            authProvider.token,
+            position.longitude,
+            position.latitude,
+          );
+        } catch (e) {
+          if (!mounted) return;
+          ScaffoldMessenger.of(context).showSnackBar(
+            SnackBar(content: Text('Ошибка геолокации: $e')),
+          );
+        }
       }
 
       if (!mounted) return;
@@ -75,6 +93,11 @@ class _MapScreenState extends State<MapScreen> {
 
   Future<void> _updateGeolocation() async {
     try {
+      final status = await Geolocator.checkPermission();
+      if (status == LocationPermission.denied) {
+        final requested = await Geolocator.requestPermission();
+        if (requested == LocationPermission.denied) return;
+      }
       final position = await Geolocator.getCurrentPosition();
       setState(() {
         _center = LatLng(position.latitude, position.longitude);
@@ -85,13 +108,20 @@ class _MapScreenState extends State<MapScreen> {
       final authProvider = context.read<AuthProvider>();
       final shareProvider = context.read<ShareProvider>();
 
-        await GeoService().updatePosition(
-          authProvider.token,
-          shareProvider.geoId,
-          position.longitude,
-          position.latitude,
-        );
-    } catch (_) {}
+      if (shareProvider.geoId.isEmpty) return;
+
+      await GeoService().updatePosition(
+        authProvider.token,
+        shareProvider.geoId,
+        position.longitude,
+        position.latitude,
+      );
+    } catch (e) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text('Ошибка обновления позиции: $e')),
+      );
+    }
   }
 
   void _copyShareLink() {
@@ -115,19 +145,22 @@ class _MapScreenState extends State<MapScreen> {
           final TextEditingController _controller = TextEditingController();
           return AlertDialog(
             title: const Text('Отслеживание'),
-            content: Column(
-              mainAxisSize: MainAxisSize.min,
-              children: [
-                const Text('Введите Share ID для отслеживания:'),
-                const SizedBox(height: 16),
-                TextField(
-                  controller: _controller,
-                  decoration: const InputDecoration(
-                    hintText: 'Введите Share ID',
-                    border: OutlineInputBorder(),
+            content: SingleChildScrollView(
+              child: Column(
+                mainAxisSize: MainAxisSize.min,
+                crossAxisAlignment: CrossAxisAlignment.stretch,
+                children: [
+                  const Text('Введите Share ID для отслеживания:'),
+                  const SizedBox(height: 16),
+                  TextField(
+                    controller: _controller,
+                    decoration: const InputDecoration(
+                      hintText: 'Введите Share ID',
+                      border: OutlineInputBorder(),
+                    ),
                   ),
-                ),
-              ],
+                ],
+              ),
             ),
             actions: [
               TextButton(
@@ -174,8 +207,8 @@ class _MapScreenState extends State<MapScreen> {
     Marker? trackedMarker;
     if (shareProvider.trackedPosition != null) {
       final pos = shareProvider.trackedPosition!;
-      final lat = pos['y'] as double;
-      final lng = pos['x'] as double;
+      final lat = pos['y'] is String ? double.parse(pos['y']) : pos['y'] as double;
+      final lng = pos['x'] is String ? double.parse(pos['x']) : pos['x'] as double;
       trackedMarker = Marker(
         point: LatLng(lat, lng),
         width: 40,
@@ -226,12 +259,14 @@ class _MapScreenState extends State<MapScreen> {
       ),
       body: FlutterMap(
         options: MapOptions(
-          center: _center,
-          zoom: 12.0,
+          initialCenter: _center,
+          initialZoom: 12.0,
         ),
         children: [
-          TileLayer(
+   TileLayer(
             urlTemplate: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
+            maxZoom: 20,
+            userAgentPackageName:'FamilySafety/1.0.0',
           ),
           MarkerLayer(
             markers: [