feat: App-Gerüst mit Spieler auf Testfläche

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package.json

@@ -0,0 +1,20 @@
+{
+  "name": "leonida",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "test": "vitest run"
+  },
+  "dependencies": {
+    "three": "0.184.0",
+    "three-mesh-bvh": "^0.9.14",
+    "three-player-controller": "file:three-player-controller",
+    "lil-gui": "^0.21.0"
+  },
+  "devDependencies": {
+    "vite": "^7.3.0",
+    "vitest": "^3.2.0"
+  }
+}