feat: add update item name functionality to items route

backend/routes/items.py

@@ -83,3 +83,16 @@ def delete_item(item_id: UUID, db: Session = Depends(get_db)):
         raise HTTPException(status_code=404, detail="Item not found")
     db.delete(item)
     db.commit()
+
+@router.put("/{item_id}", response_model=ItemOut)
+def update_item_name(item_id: UUID, payload: dict, db: Session = Depends(get_db)):
+    item = db.get(models.Item, item_id)
+    if not item:
+        raise HTTPException(status_code=404, detail="Item not found")
+    name = payload.get("name")
+    if not name or not isinstance(name, str):
+        raise HTTPException(status_code=400, detail="Missing or invalid name")
+    item.name = name
+    db.commit()
+    db.refresh(item)
+    return item