fix: complete first version issue remediation

api/src/files/files.service.ts

@@ -66,14 +66,15 @@ export class FilesService {
   }
 
   async upload(data: UploadFileDto, file: { originalname: string; mimetype: string; size: number; buffer: Buffer }) {
-    const safeName = file.originalname.replace(/[^\w.\-\u4e00-\u9fa5]/g, '_');
+    const fileName = normalizeMultipartFileName(file.originalname);
+    const safeName = fileName.replace(/[^\w.\-\u4e00-\u9fa5]/g, '_');
     const objectKey = `${data.prefix ?? data.purpose}/${Date.now()}-${randomUUID()}-${safeName}`;
     await this.objectStorage.putObject(objectKey, file.buffer, file.size, file.mimetype || 'application/octet-stream');
     return this.create({
       tenantId: data.tenantId,
       bucket: this.objectStorage.getBucket(),
       objectKey,
-      fileName: file.originalname,
+      fileName,
       contentType: file.mimetype || 'application/octet-stream',
       sizeBytes: file.size,
       purpose: data.purpose,
@@ -93,6 +94,15 @@ export class FilesService {
   }
 }
 
+function normalizeMultipartFileName(value: string) {
+  if (![...value].some((character) => character.charCodeAt(0) > 0x7f) || [...value].some((character) => character.charCodeAt(0) > 0xff)) {
+    return value;
+  }
+
+  const decoded = Buffer.from(value, 'latin1').toString('utf8');
+  return decoded.includes('\uFFFD') ? value : decoded;
+}
+
 function serializeFileObject<T extends { sizeBytes: bigint | number | string }>(fileObject: T) {
   return {
     ...fileObject,