fix: Update image upload type from '4' to '2' for correct processing

frontend/src/components/routine/RoutineEditView.vue

@@ -366,7 +366,7 @@ function onDragEnd() {
 async function uploadImage(file: File): Promise<string> {
   const formData = new FormData()
   formData.append('file', file)
-  formData.append('type', '4')
+  formData.append('type', '2')
   formData.append('permanent', 'false')
   const resp = await fetch('/api/image/upload', { method: 'POST', body: formData })
   if (!resp.ok) throw new Error('Image upload failed')