fix(ai-service): dynamically calibrate CGPA scale (4.0 vs 10.0) in profile calculation

[UTKARSHH20]

This pull request fixes the logic discrepancy in the profile analyzer score calculation.

Changes

• Calibrated CGPA calculation in ai_service/main.py to check if payload.cgpa > 4.0.
• If the input is higher than 4.0, it is evaluated on a 10.0 scale; otherwise, it is evaluated on a 4.0 scale.
• Resolves the issue where all CGPAs >= 4.0 were scored identically, ensuring correct placement probability output.

Closes #27

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