fix: tray main-thread message loop, numpy <2.0 pin, installer config copy

- Rewrite tray to run on main thread (pystray owns message loop, uvicorn
  in background thread) — fixes unresponsive confirmation dialogs
- Use native Windows MessageBoxW instead of tkinter (embedded Python
  has no tkinter)
- Pin numpy <2.0 to fix soundcard's numpy.fromstring (removed in 2.0)
- Strip transitive numpy 2.x wheels in build script
- Installer copies config.example.yaml as config.yaml on fresh install
- Suppress noisy screen_brightness_control warnings

media_server/main.py

@@ -51,6 +51,9 @@ def setup_logging():
         handlers=[handler],
     )
 
+    # Suppress noisy third-party loggers
+    logging.getLogger("screen_brightness_control").setLevel(logging.ERROR)
+
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
@@ -240,23 +243,47 @@ def main():
             print("\nAuthentication is DISABLED (no tokens configured)")
         return
 
-    # Start system tray icon (unless disabled)
-    tray_icon = None
-    if not args.no_tray:
-        from .tray import start_tray
+    from .tray import PYSTRAY_AVAILABLE, TrayManager
 
-        tray_icon = start_tray(args.host, args.port)
+    use_tray = PYSTRAY_AVAILABLE and not args.no_tray
 
-    try:
+    if use_tray:
+        import asyncio
+        import threading
+
+        # Run uvicorn in a background thread so tray owns the main thread message loop
+        uv_config = uvicorn.Config(
+            "media_server.main:app",
+            host=args.host,
+            port=args.port,
+            log_level=settings.log_level.lower(),
+        )
+        server = uvicorn.Server(uv_config)
+
+        def run_server():
+            loop = asyncio.new_event_loop()
+            asyncio.set_event_loop(loop)
+            loop.run_until_complete(server.serve())
+
+        server_thread = threading.Thread(target=run_server, daemon=True)
+        server_thread.start()
+
+        # Tray on main thread (blocking)
+        tray = TrayManager(
+            port=args.port,
+            on_exit=lambda: setattr(server, "should_exit", True),
+        )
+        tray.run()
+
+        # Tray exited — wait for server to finish graceful shutdown
+        server_thread.join(timeout=10)
+    else:
         uvicorn.run(
             "media_server.main:app",
             host=args.host,
             port=args.port,
             reload=False,
         )
-    finally:
-        if tray_icon is not None:
-            tray_icon.stop()
 
 
 if __name__ == "__main__":