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>

server/app/main.py

@@ -17,7 +17,10 @@ logger = logging.getLogger("synq")
 
 @asynccontextmanager
 async def lifespan(_: FastAPI):
-    _load_token()
+    token = _load_token()
+    logger.info("=" * 60)
+    logger.info("synq token: %s", token)
+    logger.info("=" * 60)
     yield