Migrate Gemini to Mistral for resume parsing

[TheCreeperrr]

Summary: What does this PR do?

Migrates the AI model used for resume parsing from Gemini to Mistral.

Which issue(s) this PR fixes:

Changes Made

Describe the changes you've made in this PR:

• Feature implementation
• Bug fix
• Documentation update
• Code refactoring
• Configuration changes
• Other (please specify)

Type of Change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Documentation update
• Performance improvement
• Code cleanup or refactor

How Has This Been Tested?

Describe the tests you ran:

• Unit tests
• Integration tests
• Manual tests
• Other (please specify)

Please describe the test cases and expected behavior:

1. Uploaded a resume PDF, Mistral extracted all data correctly. The form was auto-filled with the data as expected.

Screenshots (if applicable)

Dependencies

Removed @google/generative-ai, added @mistralai/mistralai.

Documentation

• I have updated the documentation accordingly
• Documentation update is not required

Comments:

Reviewer Notes

Current model being used is mistral-small-latest for both tasks.
GOOGLE_AI_KEY no longer used. MISTRAL_API_KEY needs to be added to the env config.

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