feat(remote): 完善文件传输功能及WebSocket支持

remote/src/services/file/FileService.js

@@ -44,7 +44,8 @@ class FileService {
   }
 
   getFilePath(filename) {
-    const filePath = path.join(this.uploadDir, path.basename(filename));
+    if (!filename) return null;
+    const filePath = path.normalize(filename);
     if (!fs.existsSync(filePath)) {
       return null;
     }
@@ -92,7 +93,13 @@ class FileService {
 
   mergeChunks(fileId, totalChunks, filename) {
     try {
-      const filePath = path.join(this.uploadDir, path.basename(filename));
+      const filePath = path.normalize(filename);
+      const dir = path.dirname(filePath);
+      
+      if (!fs.existsSync(dir)) {
+        fs.mkdirSync(dir, { recursive: true });
+      }
+      
       const fd = fs.openSync(filePath, 'w');
 
       for (let i = 0; i < totalChunks; i++) {