feat(migrate): wire GitHub PAT through to agent runner mirror call

MigrateSetup now sends the PAT field to the API; create route
forwards it as github_token so the agent runner can clone private repos.

Made-with: Cursor

app/api/projects/create/route.ts

@@ -66,6 +66,7 @@ export async function POST(request: Request) {
       githubRepoId,
       githubRepoUrl,
       githubDefaultBranch,
+      githubToken,
     } = body;
 
     // Check slug uniqueness
@@ -126,6 +127,7 @@ export async function POST(request: Request) {
             github_url: githubRepoUrl,
             gitea_repo: `${GITEA_ADMIN_USER}/${repoName}`,
             project_name: projectName,
+            github_token: githubToken || undefined,
           }),
         });
         if (!mirrorRes.ok) {