Ai interview resume upload

[Priyamanjare54]

📝 PR Description

1. Summary

This PR adds backend support for uploading and parsing candidate resumes (PDF/TXT).
Key features:

• Extracts name, role, skills, and years of experience from resumes
• Stores resumes on Cloudflare R2
• Saves parsed data in the database for generating AI-driven interview questions
• Includes unit tests for parser functionality

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2. Related Issue

Closes #119

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3. Type of Change

• New feature
• Test update

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4. Testing Instructions

1. Set up .env with R2 credentials and JWT secret
2. Install dependencies: npm install
3. Start the server: npm run dev
4. Test API endpoints with Postman:
   • POST /api/interviews/upload-resume → Upload PDF/TXT resumes
   • GET /api/interviews/candidates → Verify parsed data
5. Run unit tests: npm test
6. Verify error handling for invalid file types, empty files, or files >5MB

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5. Notes

• pdf-parse is used for PDF extraction
• Skills extraction is dynamic, not limited to a static list
• Ensure R2 environment variables are configured before testing

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SWOC 2026 Participant?
YES

[tarinagarwal]

@Priyamanjare54 please attach the relevant screenshots