feat: email forwarding via SMTPS

Parallel to Bark: when email forwarding is enabled and a recipient is set,
notifications are also sent via SMTP over SSL (port 465, SMTPS). Works
standalone — no Bark server required.

- core/EmailSender: SMTP over SSL (implicit TLS, port 465), AUTH LOGIN,
  UTF-8 subject/body via Base64/MIME; trySend() fire-and-forget helper
- SettingsStore: 7 email settings (enabled, host, port, user, password,
  from, to)
- NotifyListenerService + PhoneCallMonitor: call EmailSender.trySend in
  parallel with Bark forwarding; fires even if no Bark servers configured
- UI: new "电邮转发" SectionCard in settings (toggle + host/port/user/
  password/from/to fields + save button)
- version 1.6.0 -> 1.6.1 (code 10 -> 11); CLAUDE.md synced

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

app/src/main/java/com/a2i/forwarder/service/NotifyListenerService.kt

@@ -4,6 +4,7 @@ import android.service.notification.NotificationListenerService
 import android.service.notification.StatusBarNotification
 import com.a2i.forwarder.A2iApp
 import com.a2i.forwarder.core.BarkSender
+import com.a2i.forwarder.core.EmailSender
 import com.a2i.forwarder.core.ForwardLog
 import com.a2i.forwarder.core.NotificationProcessor
 import com.a2i.forwarder.core.PendingPush
@@ -61,6 +62,7 @@ class NotifyListenerService : NotificationListenerService() {
         val servers = app.settings.servers.value.filter { it.enabled && it.deviceKey.isNotBlank() }
         if (servers.isEmpty()) {
             app.logStore.addLog(ForwardLog(now, sbn.packageName, d.appLabel, msg.title, msg.body, "failed", "未配置可用 Bark 服务器"))
+            EmailSender.trySend(app, msg.title ?: d.appLabel, msg.body, scope)
             return
         }
 
@@ -74,5 +76,6 @@ class NotifyListenerService : NotificationListenerService() {
                 PendingPush(UUID.randomUUID().toString(), now, servers.first().id, json.encodeToString(msg))
             )
         }
+        EmailSender.trySend(app, msg.title ?: d.appLabel, msg.body, scope)
     }
 }