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/services/auth_service.dart

@@ -4,7 +4,7 @@ import '../config/api.dart';
 
 class AuthService {
   final http.Client _client;
-  
+
   AuthService({http.Client? client}) : _client = client ?? http.Client();
 
   Future<String> login(String login, String password) async {
@@ -13,7 +13,7 @@ class AuthService {
       headers: {'Content-Type': 'application/json'},
       body: jsonEncode({'login': login, 'password': password}),
     );
-    
+
     if (response.statusCode == 200) {
       return response.body;
     } else {
@@ -21,15 +21,23 @@ class AuthService {
     }
   }
 
-  Future<void> register(String login, String password) async {
+  Future<void> register(
+    String login,
+    String password,
+    String secretKeyHash,
+  ) async {
     final response = await _client.post(
       Uri.parse(ApiConfig.regUrl),
       headers: {'Content-Type': 'application/json'},
-      body: jsonEncode({'login': login, 'password': password}),
+      body: jsonEncode({
+        'login': login,
+        'password': password,
+        'secret_key_hash': secretKeyHash,
+      }),
     );
-    
+
     if (response.statusCode != 201) {
       throw Exception('Registration failed');
     }
   }
-}
+}

lib/services/geo_service.dart

@@ -7,7 +7,7 @@ class GeoService {
   
   GeoService({http.Client? client}) : _client = client ?? http.Client();
 
-  Future<void> updatePosition(String token, int id, double x, double y) async {
+  Future<void> updatePosition(String token, String id, double x, double y) async {
     final response = await _client.put(
       Uri.parse('${ApiConfig.geoUrl}?id=$id'),
       headers: {

lib/services/platform_service.dart

@@ -0,0 +1,8 @@
+import 'dart:io' show Platform;
+import 'package:flutter/foundation.dart' show kIsWeb;
+
+class PlatformService {
+  bool get isWeb => kIsWeb;
+  bool get isNative => !kIsWeb;
+  String get platformName => isWeb ? 'web' : Platform.isAndroid ? 'android' : Platform.isIOS ? 'ios' : Platform.isWindows ? 'windows' : Platform.isMacOS ? 'macos' : Platform.isLinux ? 'linux' : 'unknown';
+}

lib/services/settings_service.dart

@@ -0,0 +1,28 @@
+import 'package:shared_preferences/shared_preferences.dart';
+
+class SettingsService {
+  static const String _baseUrlKey = 'server_base_url';
+  static const String _defaultBaseUrl = 'https://family-safety.onrender.com/api';
+
+  String _baseUrl = _defaultBaseUrl;
+  bool _initialized = false;
+
+  String get baseUrl => _baseUrl;
+
+  Future<void> initialize() async {
+    if (_initialized) return;
+    final prefs = await SharedPreferences.getInstance();
+    _baseUrl = prefs.getString(_baseUrlKey) ?? _defaultBaseUrl;
+    _initialized = true;
+  }
+
+  Future<void> setBaseUrl(String url) async {
+    _baseUrl = url;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_baseUrlKey, url);
+  }
+
+  void resetToDefault() {
+    _baseUrl = _defaultBaseUrl;
+  }
+}

lib/services/share_service.dart

@@ -18,35 +18,18 @@ class ShareService {
     );
     
     if (response.statusCode == 201) {
-      final data = jsonDecode(response.body);
-      return {
-        'geo_id': data['geo_id'],
-        'share_id': data['share_id'],
-      };
+      try {
+        final data = jsonDecode(response.body) as Map<String, dynamic>;
+        return {
+          'geo_id': data['geo_id']?.toString() ?? '',
+          'share_id': data['share_id']?.toString() ?? '',
+        };
+      } catch (e) {
+        throw Exception('Failed to parse response: $e | Body: ${response.body.substring(0, response.body.length > 200 ? 200 : response.body.length)}');
+      }
     } else {
-      throw Exception('Failed to create share link');
-    }
-  }
-
-  Future<Map<String, dynamic>> getPosition(String token, String uniqueId) async {
-    final response = await _client.get(
-      Uri.parse('${ApiConfig.watchUrl}?unique_id=$uniqueId'),
-      headers: {
-        'Authorization': 'Bearer $token',
-      },
-    );
-    
-    if (response.statusCode == 200) {
-      final data = jsonDecode(response.body);
-      return {
-        'id': data['id'],
-        'x': data['x'],
-        'y': data['y'],
-        'created_at': data['created_at'],
-        'expires_at': data['expires_at'],
-      };
-    } else {
-      throw Exception('Share link not found or no position available');
+      final errorBody = response.body.length > 200 ? response.body.substring(0, 200) : response.body;
+      throw Exception('Failed to create share link: ${response.statusCode} - $errorBody');
     }
   }
 
@@ -59,15 +42,15 @@ class ShareService {
     );
     
     if (response.statusCode == 200) {
-      final data = jsonDecode(response.body);
+      final data = jsonDecode(response.body) as Map<String, dynamic>;
       return {
         'x': data['x'],
         'y': data['y'],
-        'created_at': data['created_at'],
-        'expires_at': data['expires_at'],
+        'last_update': data['last_update']?.toString() ?? '',
+        'expires_at': data['expires_at']?.toString() ?? '',
       };
     } else {
       throw Exception('Share link not found or no position available');
     }
   }
-}
+}