Add image upload functionality and enhance inventory template with image rendering

inventory/models/inventory.py

@@ -1,4 +1,6 @@
 from typing import Any, List, Optional, TYPE_CHECKING
+
+from inventory.models.photo import Photo
 if TYPE_CHECKING:
     from .brands import Brand 
     from .items import Item
@@ -125,3 +127,6 @@ class Inventory(db.Model, PhotoAttachable):
             barcode=data.get("barcode"),
             shared=bool(data.get("shared", False))
         )
+
+    def attach_photo(self, photo: Photo) -> None:
+        self.photo = photo