Enhance admin listing & metadata extraction, update healthchecks

- Show current admins in RegistryAdmin using new RegistryAdminDisplayModel and backend support
- Improve RegistryMetadataService: better normalization, Amazon-specific extraction for images/prices, and URL normalization
- Use normalized product URLs and improved metadata logic in RegistryAdmin
- Add error handling for Blazored.TextEditor interop issues
- Switch healthchecks in portainer-stack.yml to process checks (pidof)
- Remove appsettings.Development.json contents from source control
- Add RegistryAdminDisplayModel and NormalizedUrl to models

src/BirthList.Web/Components/Pages/RegistryAdmin.razor

@@ -20,6 +20,23 @@ else
         </div>
     }
 
+    <section class="mb-4">
+        <h2>Current admins</h2>
+        @if (Admins.Count == 0)
+        {
+            <p>No admins assigned yet.</p>
+        }
+        else
+        {
+            <ul>
+                @foreach (var admin in Admins)
+                {
+                    <li>@admin.DisplayName</li>
+                }
+            </ul>
+        }
+    </section>
+
     <section class="mb-4">
         <h2>Settings</h2>
         <EditForm Model="SettingsModel" OnValidSubmit="SaveSettingsAsync" FormName="registry-settings-form">