feat(app): 完成 P0 钱包解锁、下载落盘与手机号登录

lib/core/data/repositories/commerce_repository.dart

@@ -0,0 +1,23 @@
+// Author: fruit.com.cn
+
+import '../models/wallet.dart';
+import '../remote/commerce_api.dart';
+
+/// 钱包与金币解锁的数据来源。
+abstract interface class CommerceRepository {
+  Future<WalletSnapshot> fetchWallet();
+
+  Future<UnlockResult> unlock(String episodeId);
+}
+
+class HttpCommerceRepository implements CommerceRepository {
+  const HttpCommerceRepository(this._api);
+
+  final CommerceApi _api;
+
+  @override
+  Future<WalletSnapshot> fetchWallet() => _api.wallet();
+
+  @override
+  Future<UnlockResult> unlock(String episodeId) => _api.unlock(episodeId);
+}