refactor: consolidate upload helpers

app/api/upload/git/route.ts

@@ -3,6 +3,7 @@ import { validateUploadSecret } from '@/lib/auth'
 import { getRemoteFolder, pushAllToGitHub } from '@/lib/github'
 import { buildCommitMessage } from '@/lib/commit-message'
 import { classifyFileChanges } from '@/lib/diff-files'
+import { getModelFolderPath } from '@/lib/model-paths'
 import { cleanupStagingUpload, ensurePreparedStagingAssets, readStagedManifest } from '@/lib/upload-staging'
 import { acquireUploadLock, releaseUploadLock } from '@/lib/upload-lock'
 
@@ -52,7 +53,7 @@ export async function POST(req: NextRequest) {
     } = await ensurePreparedStagingAssets(stagingId)
 
     // --- Detect existing files and classify changes ---
-    const folderPath = `public/models/${folderName}`
+    const folderPath = getModelFolderPath(folderName)
     let remoteFileMap: Map<string, number>
 
     try {