fix: VS03 IngestionEndpoint route prefix (remove double /api)

FastEndpoints automatically adds 'api' prefix from Program.cs RoutePrefix config.
Routes should use /market/ingest, not /api/market/ingest, to avoid /api/api paths.

Fixes: TriggerIngestionEndpoint and GetIngestionStatusEndpoint route definitions.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/KArtSell.Host/Features/MarketData/VS03_IngestionEndpoint.cs

@@ -58,7 +58,7 @@ public sealed class TriggerIngestionEndpoint : Endpoint<IngestionRequest, Ingest
 
     public override void Configure()
     {
-        Post("/api/market/ingest");
+        Post("/market/ingest");  // RoutePrefix "api" is added automatically by FastEndpoints
         Roles("DataAdmin");
     }
 
@@ -111,7 +111,7 @@ public sealed class GetIngestionStatusEndpoint : EndpointWithoutRequest<Ingestio
 
     public override void Configure()
     {
-        Get("/api/market/ingest/{jobId}");
+        Get("/market/ingest/{jobId}");  // RoutePrefix "api" is added automatically by FastEndpoints
         Roles("DataAdmin");
     }