Add helper for generating a unique idempotency key from request body hash

[Chucks1093]

Summary

Mutation endpoints like alert registration and webhook registration should be idempotent when the same request is submitted twice. A shared helper that hashes the request body and returns a stable idempotency key allows duplicate detection without requiring clients to send an explicit key.

Scope

• Add hashRequestBody(body: unknown): string helper using a stable hash function (e.g. SHA-256)
• Returns a hex string of fixed length
• Same input always produces the same output
• Add unit tests for: identical objects produce identical hashes, different objects produce different hashes, empty object has a stable hash

Acceptance Criteria

• Identical input always produces the same hash
• Different inputs produce different hashes
• Output is a fixed-length hex string
• Empty object produces a valid hash without throwing

ETA: 12 hours

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