Retrieves the algorithm availability policy configured at the deployment level.
This policy controls which cryptographic algorithms are available system-wide.

The policy acts as an allow-list that affects:
• Algorithm catalogue (GET /algorithms)
• Key generation and import operations
• Key rotation requests

If no policy is configured, the system behaves as "ALLOW ALL".

Supported algorithm families: ML-KEM, HQC, FRODO, ML-DSA, SLH-DSA, FALCON,
XMSS, LMS, EC, RSA, oct

Categories: CLASSICAL, POST_QUANTUM

NIST Security Levels: L0, L1, L3, L5 (no L2 or L4)

Standards: NIST, ETSI, NSA, ISO, BSI, ANSSI, ENISA

Operations: encrypt, decrypt, sign, verify