feat: 新人初始礼包购买追踪功能

- 数据库：添加 has_purchased_starter_pack 字段到 register_bonus_claims
- 后端：创建静态配置管理套餐信息，支持按国家/地区区分
- 后端：新增 GET /api/v1/points/packages API 返回可用套餐
- 后端：创建 utils/paths.py 统一路径管理
- 前端：动态获取套餐信息，移除硬编码
- 前端：添加 ProductCode 枚举约束，前后端类型安全
- 配置：Profile 默认国家改为 US（ISO 3166-1 alpha-2）
- 文档：更新协议文档说明新 API 和字段

apps/lib/l10n/app_en.arb

@@ -190,6 +190,7 @@
   },
   "settingsCoinCenterDescription": "",
   "settingsCoinRechargeSection": "Recharge Packages",
+  "settingsCoinPackStarter": "New User Pack",
   "settingsCoinPackBasic": "Starter Pack",
   "settingsCoinPackPopular": "Popular Pack",
   "settingsCoinPackPremium": "Premium Pack",

apps/lib/l10n/app_localizations.dart

@@ -939,6 +939,12 @@ abstract class AppLocalizations {
   /// **'充值套餐'**
   String get settingsCoinRechargeSection;
 
+  /// No description provided for @settingsCoinPackStarter.
+  ///
+  /// In zh, this message translates to:
+  /// **'新人专享包'**
+  String get settingsCoinPackStarter;
+
   /// No description provided for @settingsCoinPackBasic.
   ///
   /// In zh, this message translates to:

apps/lib/l10n/app_localizations_en.dart

@@ -469,6 +469,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get settingsCoinRechargeSection => 'Recharge Packages';
 
+  @override
+  String get settingsCoinPackStarter => 'New User Pack';
+
   @override
   String get settingsCoinPackBasic => 'Starter Pack';
 

apps/lib/l10n/app_localizations_zh.dart

@@ -454,6 +454,9 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get settingsCoinRechargeSection => '充值套餐';
 
+  @override
+  String get settingsCoinPackStarter => '新人专享包';
+
   @override
   String get settingsCoinPackBasic => '入门补充包';
 
@@ -1460,6 +1463,9 @@ class AppLocalizationsZhHant extends AppLocalizationsZh {
   @override
   String get settingsCoinRechargeSection => '儲值套餐';
 
+  @override
+  String get settingsCoinPackStarter => '新人專享包';
+
   @override
   String get settingsCoinPackBasic => '入門補充包';
 

apps/lib/l10n/app_zh.arb

@@ -190,6 +190,7 @@
   },
   "settingsCoinCenterDescription": "",
   "settingsCoinRechargeSection": "充值套餐",
+  "settingsCoinPackStarter": "新人专享包",
   "settingsCoinPackBasic": "入门补充包",
   "settingsCoinPackPopular": "常用加量包",
   "settingsCoinPackPremium": "高频进阶包",

apps/lib/l10n/app_zh_hant.arb

@@ -123,6 +123,7 @@
   },
   "settingsCoinCenterDescription": "",
   "settingsCoinRechargeSection": "儲值套餐",
+  "settingsCoinPackStarter": "新人專享包",
   "settingsCoinPackBasic": "入門補充包",
   "settingsCoinPackPopular": "常用加量包",
   "settingsCoinPackPremium": "高頻進階包",