Fix Tandoor image URLs: rewrite internal API URLs to public base URL

Images returned by Tandoor API use the internal service URL when
api_url differs from base_url. Now rewritten to public URL so
browser can display them.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/tandoor.py

@@ -36,6 +36,14 @@ class TandoorClient:
             "Accept": "application/json",
         })
 
+    def _public_image_url(self, url: str) -> str:
+        """Rewrite an internal API image URL to the public base URL."""
+        if not url:
+            return ""
+        if self.api_url != self.base_url and url.startswith(self.api_url):
+            return self.base_url + url[len(self.api_url):]
+        return url
+
     # ------------------------------------------------------------------
     # Public
     # ------------------------------------------------------------------
@@ -104,7 +112,7 @@ class TandoorClient:
             items.append({
                 "id": item["id"],
                 "name": item.get("name", ""),
-                "image": item.get("image") or "",
+                "image": self._public_image_url(item.get("image") or ""),
                 "tags": [k.get("name", "") for k in item.get("keywords", []) if k.get("name")],
                 "url": f"{self.base_url}/view/recipe/{item['id']}",
             })
@@ -161,7 +169,7 @@ class TandoorClient:
         return {
             "title": data.get("name", ""),
             "description": data.get("description", ""),
-            "image_url": data.get("image") or "",
+            "image_url": self._public_image_url(data.get("image") or ""),
             "ingredients": ingredients,
             "instructions": instructions,
             "tags": tags,