refactor: simplify upload rules and remove destination flow

app/api/upload/git/route.ts

@@ -20,13 +20,11 @@ export async function POST(req: NextRequest) {
 
   // --- Parse all files ---
   let folderName: string
-  let destination: string
   let parsedFiles: Awaited<ReturnType<typeof parseMultiUpload>>['files']
 
   try {
     const parsed = await parseMultiUpload(req)
     folderName = parsed.folderName
-    destination = parsed.destination
     parsedFiles = parsed.files
   } catch (err) {
     const message = err instanceof Error ? err.message : 'Erreur inconnue'
@@ -40,10 +38,10 @@ export async function POST(req: NextRequest) {
     compressed,
     compressionError,
     textureNames,
-  } = await prepareGitAssets({ folderName, destination, parsedFiles })
+  } = await prepareGitAssets({ folderName, parsedFiles })
 
   // --- Detect existing files and classify changes ---
-  const folderPath = `public/models/${destination}/${folderName}`
+  const folderPath = `public/models/${folderName}`
   let remoteFileMap: Map<string, number>
 
   try {
@@ -72,7 +70,7 @@ export async function POST(req: NextRequest) {
 
   // --- Build commit message ---
   const commitMessage = buildCommitMessage(
-    folderName, destination, modelFilename, textureNames,
+    folderName, modelFilename, textureNames,
     compressed, isReplace, fileChanges, deletedFileNames,
   )