ui: update text + email two-line row

- Replace "转发到 iOS Bark" with "多通道转发" across HomeScreen/FilterScreen
- Email config items now use EmailServerRow (two-line layout matching
  Bark/ntfy): name + test/edit/delete on row 1, host:port + recipient
  on row 2 with up/down buttons
- version 1.8.6 -> 1.8.7 (code 23 -> 24)

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 = 23
-        versionName = "1.8.6"
+        versionCode = 24
+        versionName = "1.8.7"
     }
 
     signingConfigs {