fix: correct collision message and improve asset loading

- Fix typo in collision message from "Ihr seit koolidiert!" to "Es gab eine Kollision!"
- Reorder TODO comment in endGame method
- Rename "Früchte" folder to "Fruits" for consistency
- Add TileLoader class to preload and cache game assets
- Refactor Overlay class to use TileLoader for improved image handling

frontend/game/scripts/Game/Elements/TileLoader.js

@@ -0,0 +1,26 @@
+class TileLoader{
+    constructor(){
+        this.allSrc = [
+            "Fruits/Apfel.png",
+            "Fruits/Blaubeere.png",
+            "Snakes/blue/End.png",
+            "Snakes/blue/Head.png",
+            "Snakes/blue/Straight.png",
+            "Snakes/blue/Turn.png",
+            "Snakes/red/End.png",
+            "Snakes/red/Head.png",
+            "Snakes/red/Straight.png",
+            "Snakes/red/Turn.png",
+        ];
+
+        this.tileMap = new Map();
+
+        this.allSrc.forEach(src => {
+            const img = new Image();
+            img.src = `./assets/${src}`;
+            this.tileMap.set(src, img);
+        })
+    }
+}
+
+export default TileLoader;