Add monthly currency sync check

[gcomte]

Adds a GitHub Action that compares the supported fiat currencies against what the blockchain.info ticker API returns. Runs monthly and on manual trigger. HRK (Croatian Kuna, replaced by EUR) is excluded.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fe548595-269d-4625-82fa-61564d5caa8c

📥 Commits

Reviewing files that changed from the base of the PR and between 6355ef2 and a9c81eb.

📒 Files selected for processing (1)

• .github/workflows/currency-sync-check.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/currency-sync-check

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