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/Features/Registries/RegistryService.cs

@@ -84,6 +84,20 @@ internal sealed class RegistryService(RegistryDbContext registryDbContext)
             .ConfigureAwait(false);
     }
 
+    public async Task<IReadOnlyList<RegistryAdminDisplayModel>> GetRegistryAdminsAsync(Guid registryId, CancellationToken cancellationToken)
+    {
+        return await registryDbContext.RegistryAdmins
+            .Where(x => x.RegistryId == registryId)
+            .OrderBy(x => x.AddedAtUtc)
+            .Select(x => new RegistryAdminDisplayModel
+            {
+                UserId = x.UserId,
+                DisplayName = x.UserId
+            })
+            .ToListAsync(cancellationToken)
+            .ConfigureAwait(false);
+    }
+
     public async Task<RegistryPublicViewModel?> GetPublicRegistryByCodeAsync(string code, string? userId, CancellationToken cancellationToken)
     {
         if (string.IsNullOrWhiteSpace(code))