fix: wire MigrateSetup repoUrl to githubRepoUrl for mirror flow

Made-with: Cursor

components/project-creation/MigrateSetup.tsx

@@ -46,11 +46,12 @@ export function MigrateSetup({ workspace, onClose, onBack }: SetupProps) {
           slug: name.toLowerCase().replace(/[^a-z0-9]+/g, "-"),
           product: { name: name.trim() },
           creationMode: "migration",
+          // Top-level fields the create route reads for the mirror flow
+          githubRepoUrl: repoUrl.trim() || undefined,
+          // Preserve extra metadata for future use
           sourceData: {
-            repoUrl: repoUrl.trim() || undefined,
             liveUrl: liveUrl.trim() || undefined,
             hosting: hosting || undefined,
-            pat: pat.trim() || undefined,
           },
         }),
       });