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backend/app/services/image_service.py

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+"""Image post-processing helpers (thumbnail generation, etc.)."""
+from pathlib import Path
+
+from PIL import Image
+
+from app.core.config import settings
+
+
+def generate_thumbnail(file_path: str, max_size: int = 400) -> str:
+    full = settings.upload_path / file_path
+    if not full.exists():
+        return file_path
+
+    thumb_dir = full.parent / "thumbs"
+    thumb_dir.mkdir(exist_ok=True)
+    thumb_path = thumb_dir / full.name
+
+    try:
+        with Image.open(full) as img:
+            img.thumbnail((max_size, max_size))
+            img.save(thumb_path)
+        return str(thumb_path.relative_to(settings.upload_path))
+    except Exception:
+        return file_path