feat: add spellcheck endpoint and tests for resume content (fix #11)

[aboderinsamuel]

Summary

This PR implements spell checking for user-provided resume content (Experience, Education, and Skill) and exposes it via a new endpoint for client-triggered checks.

Related Issue

• Spell check on content added by user Spell check on content added by user #11

What’s Included

• New /resume/spellcheck GET endpoint that scans the existing in-memory resume data and returns spelling corrections.
• Response format matches the agreed structure:
  [
  { "before": "Teh dog", "after": "The dog" }
  ]
• Spellcheck logic is applied to key text fields:
  • Experience: title, company, description
  • Education: course, school
  • Skill: name, proficiency
• Added deterministic pytest that verifies a known misspelling is corrected.
• Added dependency: pyspellchecker.

Implementation Details

• Spellcheck is implemented with pyspellchecker.
• Corrections preserve capitalization (uppercase and title case).
• Only entries that actually change are returned.

Testing

• pytest test_pytest.py

Notes / Follow‑ups

• If the API response format needs richer metadata (e.g., field name, index), it should be aligned with the JavaScript client and agreed with the Pod Leader before changes.

[JocelynVelarde]

hey there please resolve the merge conflicts @aboderinsamuel