refactor(update-backend): streamline .env file handling process

- Replaced the previous method of copying .env files with a direct installation from a specified source path.
- Improved permissions and ownership settings for the .env file to enhance security.
- Added user feedback for successful file transfer and verification steps.

backend/services/vocabService.js

@@ -1933,6 +1933,8 @@ export default class VocabService {
       
       if (correctIndices.length === 0) return false;
 
+      const options = Array.isArray(parsedQuestionData?.options) ? parsedQuestionData.options : [];
+
       const correctTexts = correctIndices
         .map((i) => options[i])
         .filter((opt) => opt !== undefined && opt !== null);