Introduce core components for "Escape From Teacher" game: server, client, physics, asset system, and protocol definitions. Add Docker-Compose setup for Redis and NATS infrastructure.

pkg/game/assets.go

@@ -0,0 +1,6 @@
+package game
+
+// Manifest ist die ganze Konfigurationsdatei
+type Manifest struct {
+	Assets map[string]AssetDefinition `json:"assets"`
+}