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/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+    <monochrome android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>