chore: source app display name from platform config

android/app/src/main/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
     <application
-        android:label="mobile"
+        android:label="@string/app_name"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
         <activity

android/app/src/main/res/values/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">KiriMemo</string>
+</resources>