Add validation to reject empty key names

- KeySyncService: Validate key name in ApplyEntryChangeAsync, skip with warning
- ResourceService: Validate key name in CreateResourceKeyAsync, return error
- CreateResourceKeyRequest: Add [MinLength(1)] attribute for API validation

Author: nickprotop

cloud/src/LrmCloud.Api/Services/KeySyncService.cs

@@ -65,6 +65,13 @@ public async Task<KeySyncPushResponse> PushAsync(
             {
                 var result = await ApplyEntryChangeAsync(projectId, entry, ct);
 
+                if (result.Error != null)
+                {
+                    // Skip invalid entries (e.g., empty key names)
+                    _logger.LogWarning("Skipping entry due to validation error: {Error}", result.Error);
+                    continue;
+                }
+
                 if (result.IsConflict)
                 {
                     response.Conflicts.Add(result.Conflict!);
@@ -371,6 +378,12 @@ private async Task<EntryChangeResult> ApplyEntryChangeAsync(
         EntryChangeDto entry,
         CancellationToken ct)
     {
+        // Validate key name
+        if (string.IsNullOrWhiteSpace(entry.Key))
+        {
+            return new EntryChangeResult { Error = "Key name cannot be empty" };
+        }
+
         // Find or create the resource key
         var resourceKey = await _db.ResourceKeys
             .Include(k => k.Translations)
@@ -625,6 +638,7 @@ private class EntryChangeResult
         public string? BeforeValue { get; set; }
         public string? BeforeHash { get; set; }
         public string? BeforeComment { get; set; }
+        public string? Error { get; set; }
     }
 
     private async Task<EntryDeletionResult> ApplyEntryDeletionAsync(

cloud/src/LrmCloud.Api/Services/ResourceService.cs

@@ -160,6 +160,12 @@ public async Task<PagedResult<ResourceKeyDetailDto>> GetResourceKeysPagedAsync(
                 return (false, null, "You don't have permission to manage resources in this project");
             }
 
+            // Validate key name
+            if (string.IsNullOrWhiteSpace(request.KeyName))
+            {
+                return (false, null, "Key name cannot be empty");
+            }
+
             // Check if key already exists
             var exists = await _db.ResourceKeys
                 .AnyAsync(k => k.ProjectId == projectId && k.KeyName == request.KeyName);

cloud/src/LrmCloud.Shared/DTOs/Resources/CreateResourceKeyRequest.cs

@@ -8,6 +8,7 @@ namespace LrmCloud.Shared.DTOs.Resources;
 public class CreateResourceKeyRequest
 {
     [Required(ErrorMessage = "Key name is required")]
+    [MinLength(1, ErrorMessage = "Key name cannot be empty")]
     [MaxLength(500, ErrorMessage = "Key name must not exceed 500 characters")]
     public required string KeyName { get; set; }