add getting image

ac_cars.py

@@ -37,4 +37,12 @@ def get_car_skins(car: str) -> list[str]:
 
     skindirs = [x.path.replace(skin_path + "/","") for x in os.scandir(skin_path) if x.is_dir()]
     return skindirs
+
+def get_car_image(car: str, skin: str) -> str:
+    img_path = os.path.join(CARS_FOLDER, car,"skins", skin)
+    for name in os.listdir(img_path):
+        lower = name.lower()
+        if "preview" in lower and lower.endswith(".png") or lower.endswith(".jpg"):
+            return os.path.join(img_path, name)
+    return ""