Add Go language detection

[riddhi2778]

Fixes #171

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor

Testing

• I ran backend tests (pytest -q)
• I tested frontend/API behavior manually

Checklist

• Code is readable and beginner-friendly
• No fake or placeholder behavior introduced
• Documentation updated if needed

Overall Summary of Changes

1. Added Go/Golang language hint mapping in code_assistant.py

   • Added "go": "Go" and "golang": "Go" so explicit language hints are correctly recognized.

2. Added Go language detection patterns in LANG_SIGNATURES

   • Added Go-specific patterns like package main, func, defer, go, chan, :=, and range.

3. Added Go test coverage in test_endpoints.py

   • Added GO_CODE sample with package, imports, functions, goroutines, and channels.
   • Added test_explanation_go() to verify Go language detection.

4. Verified implementation manually

   • Tested /explanation/ endpoint through FastAPI docs.
   • API response correctly returns "language": "Go".

Implementation Screenshots

Attached below:

• API response showing "language": "Go"
• Test results screenshots
• Running Backend

[imDarshanGK]

@riddhi2778 link the related issue number in the PR description (e.g., Fixes #issue_number) and include screenshots or implementation proof so the changes can be verified easily.

[riddhi2778]

@imDarshanGK , I have updated my PR description along with the implementation screenshots. Do let me know, if any changes are required.

[imDarshanGK]

@riddhi2778 Please link the related issue number in the PR description (e.g., Fixes #issue_number) and share implementation screenshots instead of code snippets.

[riddhi2778]

okay, @imDarshanGK , give me some time, I am on it.

[riddhi2778]

@imDarshanGK , I have added the implementation images along with the issue number in the updated PR. Do let me know if any changes are required.