add forex symbol

[tanut32039]

📝 Summary

This PR [adds/modifies/deletes] the <Signal ID> signal in the registry.

🔄 Changes Introduced

• [Added/Modified/Deleted] <Signal ID>:
  • Source ID: <source_id>, ID: <id>, Routes: <routes> (if applicable)
• [If applicable] Added/Updated prefix configuration in prefix/<prefix>.yaml.
• [If applicable] Removed <Signal ID> and ensured no unresolved dependencies.

📌 Band Signaling Hub Proposal

📎 Proposal Link: [Insert Forum Link Here]

✅ Checklist

• Provided a valid Band Signaling Hub Proposal link.
• Added/Updated the signal file in the appropriate signals/<prefix>/ directory.
• Verified that any referenced prerequisite signals exist in the registry.
• Ensured no circular dependencies are introduced.
• [If applicable] Updated prefix configuration in prefix/<prefix>.yaml.
• [If applicable] Updated documentation to reflect the new/modified signal.
• [If applicable] For deleted signals: Verified that the deleted signal is not a dependency for other signals, or resolved any affected dependencies.