add app icon, fix manifest icon refs, server logs token on every startup

- mipmap-* and drawable/ icon resources from Image Asset tool
- ic_launcher_background.xml: solid #22569d (matches foreground design)
- AndroidManifest.xml: add android:icon and android:roundIcon attributes
- server/app/main.py: log token on every startup (not just first run)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

android/app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:fillColor="#22569d" android:pathData="M0,0h108v108h-108z"/>
+</vector>