fix: Remove duplicate /api prefix in FastEndpoints routes (RoutePrefix already adds it)

src/KArtSell.Host/Features/ShadowRun/Endpoint.cs

@@ -28,7 +28,7 @@ public class InitiateShadowRunEndpoint : Endpoint<InitiateShadowRunRequest, Init
 
     public override void Configure()
     {
-        Post("/api/shadow-runs");
+        Post("/shadow-runs");  // RoutePrefix "api" added automatically in Program.cs
         Roles("Admin", "Researcher");  // RBAC: Only Admin or Researcher can initiate
         Validator<InitiateShadowRunValidator>();
     }

src/KArtSell.Host/Features/ShadowRun/GetShadowRunPollingEndpoint.cs

@@ -27,7 +27,7 @@ public class GetShadowRunPollingEndpoint : Endpoint<GetShadowRunPollingRequest,
 
     public override void Configure()
     {
-        Get("/api/shadow-runs/{RunId}");
+        Get("/shadow-runs/{RunId}");  // RoutePrefix "api" added automatically in Program.cs
         Roles("Admin", "Analyst");  // RBAC: Only Admin or Analyst can poll
     }