feat: SMS fallback refactor - user-controllable filters/limits/balance

New user options:
- Content filter: important-only (default) or forward-all
- Rate limit: toggle on/off, adjustable minutes
- Balance check: toggle on/off (off = no suspend, no decrement)

UI: SMS section now has 3 SwitchRows under target list, with
balance/carrier/quota status + "解除挂起" button shown when
balance check is on.

Logic: SmsFallbackForwarder reads new flags to skip checks;
CarrierBalanceQuery guards decrement/suspend on flag.

version 1.9.9 -> 1.10.0 (code 38 -> 39)

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

app/build.gradle.kts

@@ -13,8 +13,8 @@ android {
         applicationId = "com.a2i.forwarder"
         minSdk = 34
         targetSdk = 36
-        versionCode = 38
-        versionName = "1.9.9"
+        versionCode = 39
+        versionName = "1.10.0"
     }
 
     signingConfigs {

app/src/main/java/com/a2i/forwarder/core/CarrierBalanceQuery.kt

@@ -35,6 +35,7 @@ class CarrierBalanceQuery(private val context: Context) {
 
     /** 转发成功后扣减余额（手动模式 / 自动解析失败时）。 */
     suspend fun decrementManual() {
+        if (!settings.smsBalanceCheck.value) return    // 余额检查关闭时不递减
         val q = settings.smsManualQuota.value
         if (q > 0) {
             val newQ = q - 1
@@ -66,6 +67,7 @@ class CarrierBalanceQuery(private val context: Context) {
     }
 
     private suspend fun checkSuspend(balance: Int) {
+        if (!settings.smsBalanceCheck.value) return    // 余额检查关闭时不挂起
         if (balance in 0..5 && !settings.smsSuspended.value) {
             settings.setSmsSuspended(true)
         }

app/src/main/java/com/a2i/forwarder/core/SmsFallbackForwarder.kt

@@ -13,21 +13,21 @@ import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.launch
 
 /**
- * 短信兜底转发器：断网时把紧要通知（验证码、来电）用短信发到 iPhone。
- * 限频：每 5 分钟最多 1 条转发短信。余额 ≤5 时自动挂起。
+ * 短信兜底转发器：断网时把通知用短信发到目标手机。
+ * 用户可配置：内容过滤（仅紧要/全部）、限频（开关+分钟）、余额检查（开关）。
  */
 class SmsFallbackForwarder(private val context: Context) {
     private val scope = CoroutineScope(SupervisorJob() + Dispatchers.IO)
-    private val RATE_LIMIT_MS = 5 * 60 * 1000L
 
     private val app get() = A2iApp.instance
     private val settings get() = app.settings
 
-    /** 判断该通知是否值得走短信（断网资源宝贵）。 */
+    /** 判断该通知是否值得走短信（受用户设置控制）。 */
     fun isSmsWorthy(d: Decision): Boolean {
-        if (d.code != null) return true                      // 验证码
+        if (settings.smsFilterAll.value) return true              // 全部转发模式
+        if (d.code != null) return true                            // 验证码
         val msg = d.message ?: return false
-        if (msg.group == "phone_call") return true           // 来电/未接来电
+        if (msg.group == "phone_call") return true                // 来电/未接来电
         val t = msg.title.orEmpty()
         return t.contains("来电") || t.contains("未接")
     }
@@ -35,24 +35,31 @@ class SmsFallbackForwarder(private val context: Context) {
     /** 尝试用短信转发（遍历所有启用的目标号，按 stopOnFirst 决定发通一条止还是全发）。 */
     fun forward(d: Decision) {
         scope.launch {
-            if (settings.smsSuspended.value) {
+            val s = settings
+            // ① 余额检查（用户可关）
+            if (s.smsBalanceCheck.value && s.smsSuspended.value) {
                 log(d, "failed", "短信已挂起（余额不足）")
                 return@launch
             }
+            // ② 内容过滤（用户可关，关=全部转发）
             if (!isSmsWorthy(d)) return@launch
-            val targets = settings.smsTargets.value.filter { it.enabled && it.number.isNotBlank() }
+            // ③ 目标号
+            val targets = s.smsTargets.value.filter { it.enabled && it.number.isNotBlank() }
             if (targets.isEmpty()) {
                 log(d, "failed", "未设置短信目标号")
                 return@launch
             }
-            // 限频
+            // ④ 限频（用户可关）
             val now = System.currentTimeMillis()
-            val elapsed = now - settings.lastSmsSentTime.value
-            if (elapsed < RATE_LIMIT_MS) {
-                log(d, "filtered", "限频（${RATE_LIMIT_MS - elapsed}ms 内）")
-                return@launch
+            if (s.smsRateLimitEnabled.value) {
+                val limitMs = s.smsRateLimitMin.value.coerceIn(1, 60) * 60 * 1000L
+                val elapsed = now - s.lastSmsSentTime.value
+                if (elapsed < limitMs) {
+                    log(d, "filtered", "限频（${limitMs - elapsed}ms 内）")
+                    return@launch
+                }
             }
-            // 权限
+            // ⑤ 权限（始终检查）
             if (ContextCompat.checkSelfPermission(context, Manifest.permission.SEND_SMS)
                 != PackageManager.PERMISSION_GRANTED
             ) {
@@ -60,8 +67,9 @@ class SmsFallbackForwarder(private val context: Context) {
                 return@launch
             }
 
+            // ⑥ 发送
             val body = compose(d).take(70)
-            val stopOnFirst = settings.smsStopOnFirst.value
+            val stopOnFirst = s.smsStopOnFirst.value
             var anyOk = false
             var sentCount = 0
             var lastReason = "短信发送失败"
@@ -78,14 +86,16 @@ class SmsFallbackForwarder(private val context: Context) {
                 }
             }
             if (anyOk) {
-                settings.setLastSmsSentTime(now)
+                s.setLastSmsSentTime(now)
                 log(d, "sent", "")
-                // 余额递减：按成功发送条数；自动模式发查询短信，手动模式递减
-                val carrier = app.carrierBalanceQuery.currentCarrier()
-                if (carrier.serviceNumber != null && carrier.queryCmd != null) {
-                    app.carrierBalanceQuery.refresh()
-                } else {
-                    repeat(sentCount) { runCatching { app.carrierBalanceQuery.decrementManual() } }
+                // 余额递减（仅余额检查开启时）
+                if (s.smsBalanceCheck.value) {
+                    val carrier = app.carrierBalanceQuery.currentCarrier()
+                    if (carrier.serviceNumber != null && carrier.queryCmd != null) {
+                        app.carrierBalanceQuery.refresh()
+                    } else {
+                        repeat(sentCount) { runCatching { app.carrierBalanceQuery.decrementManual() } }
+                    }
                 }
             } else {
                 log(d, "failed", lastReason)

app/src/main/java/com/a2i/forwarder/store/SettingsStore.kt

@@ -56,6 +56,10 @@ class SettingsStore(
         val SMS_BALANCE = intPreferencesKey("sms_balance")
         val SMS_SUSPENDED = booleanPreferencesKey("sms_suspended")
         val SMS_LAST_SENT = longPreferencesKey("sms_last_sent")
+        val SMS_FILTER_ALL = booleanPreferencesKey("sms_filter_all")           // true=全部转发 false=仅紧要
+        val SMS_RATE_LIMIT_ENABLED = booleanPreferencesKey("sms_rate_limit_en")
+        val SMS_RATE_LIMIT_MIN = intPreferencesKey("sms_rate_limit_min")
+        val SMS_BALANCE_CHECK = booleanPreferencesKey("sms_balance_check")
         // 电邮转发
         val EMAIL_ENABLED = booleanPreferencesKey("email_enabled")
         val EMAIL_SERVERS = stringPreferencesKey("email_servers")
@@ -121,6 +125,10 @@ class SettingsStore(
     val smsBalance = MutableStateFlow(-1)
     val smsSuspended = MutableStateFlow(false)
     val lastSmsSentTime = MutableStateFlow(0L)
+    val smsFilterAll = MutableStateFlow(false)           // true=全部转发 false=仅紧要
+    val smsRateLimitEnabled = MutableStateFlow(true)
+    val smsRateLimitMin = MutableStateFlow(5)
+    val smsBalanceCheck = MutableStateFlow(true)
 
     // 电邮总开关
     val emailForwardingEnabled = MutableStateFlow(false)
@@ -159,6 +167,10 @@ class SettingsStore(
                 smsBalance.value = p[K.SMS_BALANCE] ?: -1
                 smsSuspended.value = p[K.SMS_SUSPENDED] ?: false
                 lastSmsSentTime.value = p[K.SMS_LAST_SENT] ?: 0L
+                smsFilterAll.value = p[K.SMS_FILTER_ALL] ?: false
+                smsRateLimitEnabled.value = p[K.SMS_RATE_LIMIT_ENABLED] ?: true
+                smsRateLimitMin.value = p[K.SMS_RATE_LIMIT_MIN] ?: 5
+                smsBalanceCheck.value = p[K.SMS_BALANCE_CHECK] ?: true
                 // 电邮总开关
                 emailForwardingEnabled.value = p[K.EMAIL_ENABLED] ?: false
                 // 应用更新
@@ -343,6 +355,10 @@ class SettingsStore(
     suspend fun setSmsBalance(v: Int) { edit { it[K.SMS_BALANCE] = v }; smsBalance.value = v }
     suspend fun setSmsSuspended(v: Boolean) { edit { it[K.SMS_SUSPENDED] = v }; smsSuspended.value = v }
     suspend fun setLastSmsSentTime(v: Long) { edit { it[K.SMS_LAST_SENT] = v }; lastSmsSentTime.value = v }
+    suspend fun setSmsFilterAll(v: Boolean) { edit { it[K.SMS_FILTER_ALL] = v }; smsFilterAll.value = v }
+    suspend fun setSmsRateLimitEnabled(v: Boolean) { edit { it[K.SMS_RATE_LIMIT_ENABLED] = v }; smsRateLimitEnabled.value = v }
+    suspend fun setSmsRateLimitMin(v: Int) { edit { it[K.SMS_RATE_LIMIT_MIN] = v }; smsRateLimitMin.value = v }
+    suspend fun setSmsBalanceCheck(v: Boolean) { edit { it[K.SMS_BALANCE_CHECK] = v }; smsBalanceCheck.value = v }
 
     suspend fun setUpdateCheckEnabled(v: Boolean) { edit { it[K.UPDATE_CHECK_AUTO] = v }; updateCheckEnabled.value = v }
     suspend fun setLastUpdateCheck(v: Long) { edit { it[K.LAST_UPDATE_CHECK] = v }; lastUpdateCheckTime.value = v }

app/src/main/java/com/a2i/forwarder/ui/screens/SettingsScreen.kt

@@ -113,6 +113,10 @@ fun SettingsScreen(onOpenLog: () -> Unit) {
     val meowServers by app.settings.meowServers.collectAsState()
     val emailServers by app.settings.emailServers.collectAsState()
     val smsTargets by app.settings.smsTargets.collectAsState()
+    val smsFilterAll by app.settings.smsFilterAll.collectAsState()
+    val smsRateLimitEnabled by app.settings.smsRateLimitEnabled.collectAsState()
+    val smsRateLimitMin by app.settings.smsRateLimitMin.collectAsState()
+    val smsBalanceCheck by app.settings.smsBalanceCheck.collectAsState()
     val barkStopFirst by app.settings.barkStopOnFirst.collectAsState()
     val ntfyStopFirst by app.settings.ntfyStopOnFirst.collectAsState()
     val meowStopFirst by app.settings.meowStopOnFirst.collectAsState()
@@ -312,7 +316,7 @@ fun SettingsScreen(onOpenLog: () -> Unit) {
             SectionCard {
                 ChannelSectionHeader(
                     title = "断网短信兜底",
-                    summary = "无网络时发送关键通知",
+                    summary = "无网络时用短信发送通知",
                     mark = "S",
                     markColor = Color(0xFF00897B),
                     markIcon = Icons.Filled.Sms,
@@ -342,13 +346,48 @@ fun SettingsScreen(onOpenLog: () -> Unit) {
                     }
                 }
                 AddButton { showAddSms = true }
-                Spacer(Modifier.size(8.dp))
-                val balanceText = when {
-                    smsSuspended -> "已挂起（余额不足）"
-                    smsBalance < 0 -> "余额未知"
-                    else -> "剩余约 $smsBalance 条"
+
+                // ── 高级设置 ──
+                Spacer(Modifier.size(12.dp))
+                SwitchRow(
+                    title = "仅紧要通知",
+                    subtitle = if (smsFilterAll) "当前：全部转发（不限内容）" else "当前：仅验证码 + 来电",
+                    checked = !smsFilterAll,
+                    icon = Icons.Filled.Settings,
+                ) { v -> app.appScope.launch { app.settings.setSmsFilterAll(!v) } }
+
+                SwitchRow(
+                    title = "限频",
+                    subtitle = if (smsRateLimitEnabled) "每 ${smsRateLimitMin} 分钟最多 1 条" else "已关闭（来一条发一条）",
+                    checked = smsRateLimitEnabled,
+                ) { v -> app.appScope.launch { app.settings.setSmsRateLimitEnabled(v) } }
+
+                SwitchRow(
+                    title = "余额检查",
+                    subtitle = if (smsBalanceCheck) "余额 ≤5 自动挂起" else "已关闭（不限余额）",
+                    checked = smsBalanceCheck,
+                ) { v -> app.appScope.launch { app.settings.setSmsBalanceCheck(v) } }
+
+                // 余额检查开启时显示运营商/额度/挂起状态
+                if (smsBalanceCheck) {
+                    Spacer(Modifier.size(8.dp))
+                    val balanceText = when {
+                        smsSuspended -> "已挂起（余额不足）"
+                        smsBalance < 0 -> "余额未知"
+                        else -> "剩余约 $smsBalance 条"
+                    }
+                    Text("运营商：${detectedCarrier.displayName}  ·  $balanceText  ·  手动额度：$smsManualQuota", style = MaterialTheme.typography.bodySmall, color = if (smsSuspended) MaterialTheme.colorScheme.error else MaterialTheme.colorScheme.onSurfaceVariant)
+                    if (smsSuspended) {
+                        Spacer(Modifier.size(4.dp))
+                        OutlinedButton(onClick = {
+                            app.appScope.launch {
+                                app.settings.setSmsSuspended(false)
+                                val q = smsManualQuota
+                                if (q > 0) app.settings.setSmsBalance(q)
+                            }
+                        }, modifier = Modifier.fillMaxWidth()) { Text("解除挂起") }
+                    }
                 }
-                Text("运营商：${detectedCarrier.displayName}  ·  余额：$balanceText  ·  手动额度：$smsManualQuota", style = MaterialTheme.typography.bodySmall, color = if (smsSuspended) MaterialTheme.colorScheme.error else MaterialTheme.colorScheme.onSurfaceVariant)
             }
         }