hobokenchicken 9b8483e797 feat(security): implement AES-256-GCM encryption for API keys and HMAC-signed session tokens ...

This commit introduces:
- AES-256-GCM encryption for LLM provider API keys in the database.
- HMAC-SHA256 signed session tokens with activity-based refresh logic.
- Standardized frontend XSS protection using a global escapeHtml utility.
- Hardened security headers and request body size limits.
- Improved database integrity with foreign key enforcement and atomic transactions.
- Integration tests for the full encrypted key storage and proxy usage lifecycle.

2026-03-06 14:17:56 -05:00

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