feat: 添加缓存作用域支持多用户数据隔离

apps/lib/data/models/dial_codes.dart

@@ -0,0 +1,17 @@
+class DialCode {
+  const DialCode(this.value);
+
+  final String value;
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is DialCode &&
+          runtimeType == other.runtimeType &&
+          value == other.value;
+
+  @override
+  int get hashCode => value.hashCode;
+}
+
+const kDialCodes = <DialCode>[DialCode('+86')];