Fix/issue 2340 gdpr analytics anonymization

[Prateek2007-cmd]

Description

Resolves Issue #2340 (Raw IP Storage / Privacy Compliance Violation).

The Interaction tracking database was previously configured to store raw IP addresses and session IDs in plain text to power the ML recommendation engine. This presented a severe data privacy risk and violated GDPR/CCPA regulations regarding PII.

This PR implements a robust anonymization layer to sanitize telemetry data before persistence.

Changes Made

• Salted Hashing: Refactored the /feedback analytics route in recommendation.py to hash the incoming user_id using SHA-256 combined with the backend's SECRET_KEY as a salt.
• Data Integrity: The ML engine can still reliably group anonymous interactions together via the deterministic hash, while completely preventing any reverse engineering of the original PII.

Type of Change

• Security Fix
• Regulatory Compliance

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