feat: offline SMS fallback for important notifications

断网时把验证码、来电用短信发到 iPhone：
- ConnectivityMonitor: NetworkCallback 监听在线状态
- CarrierDetector: SIM MCC+MNC 映射移动/联通/电信/广电
- CarrierBalanceQuery: 发免费查询短信拿套餐短信余量，解析回执
- SmsFallbackForwarder: 限频(5min)/余额(≤5挂起)/紧要性检查
- NotificationProcessor 拦截运营商回执(10086/10010/10001/10099)
- 设置页新增短信兜底卡片，首页余额耗尽警告

版本 1.3.0 → 1.4.0

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/src/main/AndroidManifest.xml

@@ -5,6 +5,7 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.READ_PHONE_STATE" />
+    <uses-permission android:name="android.permission.SEND_SMS" />
     <uses-permission android:name="android.permission.QUERY_ALL_PACKAGES"
         tools:ignore="QueryAllPackagesPermission" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />