Fix/issue 2361 anonymize pii analytics

[Prateek2007-cmd]

Description

Resolves Issue #2361 (Raw IP Storage in Analytics / GDPR Violation).

The track_feedback API endpoint, responsible for collecting user telemetry for the ML recommendation engine, was permanently recording raw user_id strings (which dynamically fallback to raw IP addresses or identifiable session tokens on the frontend) directly into the database. This constituted a severe data compliance liability under GDPR and CCPA.

This PR implements mandatory cryptographic PII anonymization for all telemetry ingestion.

Changes Made

• Cryptographic Hashing: Imported hashlib and securely wrapped the incoming user_id string through a SHA-256 hashing function.
• Salted Integrity: Infused the hashing process with the server's SECRET_KEY as a cryptographic salt. This prevents reverse-engineering via rainbow tables while maintaining deterministic consistency for the Faiss Vector index and Collaborative Filtering algorithms.

Type of Change

• Security & Compliance Fix
• Privacy Hardening

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