feat(shows): add uploaded show images

backend/shows/admin.py

@@ -7,11 +7,36 @@ from .models import Performance, Show, Venue
 
 @admin.register(Show)
 class ShowAdmin(admin.ModelAdmin):
-    list_display = ("title", "slug", "is_published", "created_at", "updated_at")
+    list_display = ("title", "slug", "is_published", "image_preview", "created_at", "updated_at")
     list_filter = ("is_published",)
     search_fields = ("title", "slug", "summary", "description")
     prepopulated_fields = {"slug": ("title",)}
-    readonly_fields = ("created_at", "updated_at")
+    readonly_fields = ("image_preview", "created_at", "updated_at")
+    fields = (
+        "title",
+        "slug",
+        "summary",
+        "description",
+        "uploaded_image",
+        "poster_image",
+        "image_preview",
+        "is_published",
+        "created_at",
+        "updated_at",
+    )
+
+    @admin.display(description="Preview")
+    def image_preview(self, obj):
+        if not getattr(obj, "pk", None):
+            return "-"
+        image_url = obj.image_url()
+        if not image_url:
+            return "No image"
+        return format_html(
+            '<img src="{}" alt="{}" style="max-width: 120px; border-radius: 6px;" />',
+            image_url,
+            obj.title,
+        )
 
 
 @admin.register(Venue)