feat(comfyuimini): add "Manage Photos" sidebar link to the Gallery

ComfyUIMini's built-in gallery is view-only. Inject a "Manage Photos"
link into its sidebar (via the shared head.ejs partial at build time, so
no fork) that points to the Model Manager's delete-capable Gallery. The
URL is built client-side from the browser host; the port is baked from
the MODEL_MANAGER_PORT build arg (default 8189).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docker-compose.yml

@@ -95,6 +95,8 @@ services:
       dockerfile: Dockerfile
       args:
         COMFYUIMINI_REF: "${COMFYUIMINI_REF:-main}"
+        # Port of the Model Manager, baked into the "Manage Photos" sidebar link
+        MODEL_MANAGER_PORT: "${MODEL_MANAGER_PORT:-8189}"
 
     image: comfyuimini:latest
     container_name: comfyuimini