Notrufnummern-Datenbasis, Ländererkennung, State-Management und Lokalisierung (AP1-AP7)

Implementiert den kompletten Kern-Flow der Emergency App gemäß docs/plan.md:
- Notrufnummern-Datenbasis für 199 Länder + Modelle/Repository (AP1)
- DialerService für tel:-Notrufe ohne Auto-Dial (AP2)
- Statisches UI mit Panik-Button-Fallback (AP3)
- Priorisierte Ländererkennung: SIM/Netz -> GPS/Geocoding -> Cache (AP4)
- EmergencyProvider verdrahtet Repository/LocationService mit der UI (AP5)
- Manuelle Länderauswahl als Fallback samt eigener Priorität (AP6)
- UI-Lokalisierung (de/en/fr/es), an erkanntes Land gekoppelt (AP7)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

lib/models/country.dart

@@ -0,0 +1,56 @@
+import 'emergency_number.dart';
+
+/// Ein Land mit seinen landesspezifischen Notrufnummern.
+class Country {
+  const Country({
+    required this.isoCode,
+    required this.nameDe,
+    required this.nameEn,
+    required this.flag,
+    required this.numbers,
+  });
+
+  /// ISO 3166-1 alpha-2 Code, z. B. "DE".
+  final String isoCode;
+  final String nameDe;
+  final String nameEn;
+  final String flag;
+  final List<EmergencyNumber> numbers;
+
+  factory Country.fromJson(String isoCode, Map<String, dynamic> json) {
+    final numbersJson = json['numbers'] as List<dynamic>;
+    return Country(
+      isoCode: isoCode,
+      nameDe: json['name_de'] as String,
+      nameEn: json['name_en'] as String,
+      flag: json['flag'] as String,
+      numbers: numbersJson
+          .map((e) => EmergencyNumber.fromJson(e as Map<String, dynamic>))
+          .toList(growable: false),
+    );
+  }
+
+  @override
+  String toString() => 'Country(isoCode: $isoCode, nameEn: $nameEn)';
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      (other is Country &&
+          other.isoCode == isoCode &&
+          other.nameDe == nameDe &&
+          other.nameEn == nameEn &&
+          other.flag == flag &&
+          _listEquals(other.numbers, numbers));
+
+  @override
+  int get hashCode => Object.hash(isoCode, nameDe, nameEn, flag, Object.hashAll(numbers));
+
+  static bool _listEquals(List<EmergencyNumber> a, List<EmergencyNumber> b) {
+    if (a.length != b.length) return false;
+    for (var i = 0; i < a.length; i++) {
+      if (a[i] != b[i]) return false;
+    }
+    return true;
+  }
+}