refactor(settings): 统一语言设置，合并 interface_language 和 ai_language

- 后端 Schema 将 interface_language 和 ai_language 合并为 language
- 前端设置界面只保留一个语言选项
- AI 回复语言统一使用 language 设置
- 更新协议文档
- 新增数据库迁移脚本

apps/lib/l10n/app_zh.arb

@@ -83,8 +83,7 @@
   "settingsSectionPrivacy": "隐私设置",
   "settingsSectionNotification": "通知设置",
   "settingsAccountAndDataTitle": "账号数据",
-  "settingsInterfaceLanguage": "界面语言",
-  "settingsAiLanguage": "AI回复语言",
+  "settingsLanguage": "语言",
   "settingsNotificationAllow": "允许通知",
   "settingsNotificationVibration": "允许振动",
   "settingsSectionAbout": "关于",
@@ -111,12 +110,8 @@
     }
   },
   "settingsCoinHeroSubtitle": "点数可用于后续起卦与相关服务消费",
-  "settingsAiLanguage": "AI 回复语言",
-  "settingsAiLanguageHint": "该字段将对齐 profiles.settings.preferences.ai_language，后续接入真实偏好设置。",
   "settingsTimezone": "时区",
   "settingsTimezoneHint": "该字段将对齐 profiles.settings.preferences.timezone，后续提供时区选择。",
-  "settingsCountry": "国家/地区",
-  "settingsCountryHint": "该字段将对齐 profiles.settings.preferences.country，后续提供国家或地区选择。",
   "settingsPrivacyProfileVisibility": "资料可见性",
   "settingsPrivacyPersonalization": "个性化推荐",
   "settingsPrivacyHistoryVisibility": "历史记录展示",
@@ -195,6 +190,7 @@
   "settingsCoinPackPopular": "常用加量包",
   "settingsCoinPackPremium": "高频进阶包",
   "settingsCoinPackPopularBadge": "推荐",
+  "settingsCoinPackNewUserBadge": "限购一次",
   "settingsPurchaseButton": "立即支付",
   "settingsPurchasePending": "",
   "settingsCoinAmount": "{amount} 点数",
@@ -511,5 +507,51 @@
   "paymentProductNotFound": "商品暂时不可用",
   "paymentStarterPackIneligible": "新手包每位用户仅限购买一次",
   "paymentProductUnavailable": "商品暂时不可用",
-  "paymentPending": "Apple 正在处理中，请稍候"
+  "paymentPending": "Apple 正在处理中，请稍候",
+  "notifyCenterTitle": "通知",
+  "notifyMarkAllRead": "全部已读",
+  "notifyLoadFailed": "加载失败",
+  "notifyRetry": "重试",
+  "notifyEmpty": "暂无通知",
+  "timeJustNow": "刚刚",
+  "timeMinutesAgo": "{minutes}分钟前",
+  "@timeMinutesAgo": {
+    "placeholders": {
+      "minutes": {
+        "type": "int"
+      }
+    }
+  },
+  "timeHoursAgo": "{hours}小时前",
+  "@timeHoursAgo": {
+    "placeholders": {
+      "hours": {
+        "type": "int"
+      }
+    }
+  },
+  "timeDaysAgo": "{days}天前",
+  "@timeDaysAgo": {
+    "placeholders": {
+      "days": {
+        "type": "int"
+      }
+    }
+  },
+  "pointsLedgerTitle": "积分流水",
+  "pointsLedgerEmpty": "暂无流水记录",
+  "pointsLedgerTypeRegister": "注册赠送",
+  "pointsLedgerTypePurchase": "购买积分包",
+  "pointsLedgerTypeConsume": "AI 对话消耗",
+  "pointsLedgerTypeAdjust": "系统调整",
+  "pointsLedgerTypeRefund": "退款",
+  "pointsLedgerBalance": "余额 {balance}",
+  "@pointsLedgerBalance": {
+    "placeholders": {
+      "balance": {
+        "type": "int"
+      }
+    }
+  },
+  "retry": "重试"
 }