Add structured translation response from Gemini using XML-like tags

[hemanth5055]

Pull Request Description:
This PR updates the translation endpoint to make Gemini return both the translated code and the detected source language in a structured, parseable format.

Changes Made

• Modified handleTranslate function to update the LLM prompt and enforce XML-like tags:

  <TranslatedLanguage>...</TranslatedLanguage>
  <SourceLanguage>...</SourceLanguage>

• Implemented regex parsing to extract both translation and sourceLanguage from the model’s response.

• Removed the need for a separate language detection call.

• Maintained analytics update for translation tracking.

Benefits

• Reduces API calls by integrating language detection and translation in one request.
• Provides a consistent, easily parseable response format.
• Improves latency and simplifies client-side handling.

Testing

• Verified response structure for multiple languages.
• Confirmed accurate parsing using regex patterns.
• Checked that analytics updates still function correctly.

🔖 Related Issue

Fixes #52

[dineshsutihar]

Awesome work! 🎉