Add platform-specific implementations for assets, audio, WebSocket, and rendering on Desktop and WebAssembly platforms. Introduce embedded assets for WebAssembly and native file handling for Desktop. Add platform-specific chunk loading and game state synchronization.

cmd/client/gameover_native.go

@@ -0,0 +1,9 @@
+//go:build !wasm
+// +build !wasm
+
+package main
+
+// sendGameOverToJS ist ein Stub für Native (kein HTML)
+func (g *Game) sendGameOverToJS(score int) {
+	// Native hat kein HTML-Overlay, nichts zu tun
+}