feat: Stripe-Key-Checker, Krea AI Pattern, Scan-Progress-Tracking

- StripeKeyChecker: 2-Schritt-Check (/v1/balance + /v1/account), Live/Test-Erkennung, Balance, Account-Details
- KeyPatterns: Stripe-Patterns einkommentiert (sk_live_, sk_test_), Krea AI Pattern (UUID:Token), Mindest-Suchlänge 4
- KeyScannerService: Stripe-Check integriert, Auto-Check nach Scan entfernt (manuell separat), Progress-Tracking (Phase, Detail, Current/Total, KeysFound)
- ApiKeysEndpoint: Stripe in HandleCheck/HandleCheckAll/HandleAdopt, Progress im Status-Endpoint
- Frontend: Live-Fortschrittsanzeige mit Spinner, Phase, Query, Counter, Polling 1.5s, Krea AI in typeNames/typeIcons

Endpoints/ApiKeysEndpoint.cs

@@ -220,6 +220,27 @@ public static class ApiKeysEndpoint
                 await ctx.Response.WriteAsJsonAsync(new { status = dbStatus, message = result.Message, plan = result.Message });
                 break;
             }
+            case "stripe":
+            {
+                var result = await StripeKeyChecker.CheckKeyAsync(httpFactory, existing.ApiKey);
+                var dbStatus = result.Status == "ok" ? "valid" : result.Status;
+                await db.UpdateApiKeyMeta(keyId, dbStatus, result.Message, null, null);
+                await ctx.Response.WriteAsJsonAsync(new {
+                    status = dbStatus,
+                    message = result.Message,
+                    plan = result.IsLiveKey ? "Live" : "Test",
+                    result.AccountId,
+                    result.AccountName,
+                    result.AccountEmail,
+                    result.AccountCountry,
+                    result.Currency,
+                    result.BalanceAvailable,
+                    result.BalancePending,
+                    result.ChargesEnabled,
+                    result.PayoutsEnabled
+                });
+                break;
+            }
             default:
             {
                 ctx.Response.StatusCode = 400;
@@ -264,6 +285,14 @@ public static class ApiKeysEndpoint
                     results.Add(new { key.KeyId, key.Name, status = dbStatus, Plan = result.Message, Usage5h = (double?)null, Usage7d = (double?)null });
                     break;
                 }
+                case "stripe":
+                {
+                    var result = await StripeKeyChecker.CheckKeyAsync(httpFactory, key.ApiKey);
+                    var dbStatus = result.Status == "ok" ? "valid" : result.Status;
+                    await db.UpdateApiKeyMeta(key.KeyId, dbStatus, result.Message, null, null);
+                    results.Add(new { key.KeyId, key.Name, status = dbStatus, Plan = result.IsLiveKey ? "Live" : "Test", Usage5h = (double?)null, Usage7d = (double?)null });
+                    break;
+                }
             }
         }
 
@@ -294,11 +323,17 @@ public static class ApiKeysEndpoint
     {
         if (!ctx.IsAdmin()) { ctx.Response.StatusCode = 403; return Task.CompletedTask; }
 
+        var progress = scanner.Progress;
         return ctx.Response.WriteAsJsonAsync(new
         {
             running = scanner.IsRunning,
             lastRun = scanner.LastRun,
-            lastResult = scanner.LastResult
+            lastResult = scanner.LastResult,
+            phase = progress.Phase,
+            detail = progress.Detail,
+            current = progress.Current,
+            total = progress.Total,
+            keysFound = progress.KeysFound
         });
     }
 
@@ -426,6 +461,7 @@ public static class ApiKeysEndpoint
         string provider;
         if (keyType.StartsWith("openai")) provider = "openai";
         else if (keyType == "google_api") provider = "google";
+        else if (keyType.StartsWith("stripe")) provider = "stripe";
         else provider = "anthropic";
 
         var record = new ApiKeyRecord