fix(p2p): remove Syria from blocked countries list

[as206em]

Description

Removes Syria (SY) from blockedCountries in p2p/p2p.go, so peers connecting from Syrian IP addresses are no longer rejected with ErrBannedCountry.

The country-level US sanctions that this entry appears to reflect are no longer in force:

• 2025-07-01 – The US Syria sanctions program was terminated by Executive Order 14312.
• 2025-08-26 – OFAC removed the Syrian Sanctions Regulations (31 CFR Part 542) from the Code of Federal Regulations.
• 2025-09-02 – BIS final rule relaxed export controls for Syria; License Exception SPP (15 CFR 740.5) covers EAR99 items, which includes most commercial and open-source software.
• 2025-12-18 – The Caesar Syria Civilian Protection Act was repealed.
• 2026-08-24 – Syria's designation as a State Sponsor of Terrorism was rescinded (Al Jazeera, US News).
• The EU (2025-05-28), UK, Canada and Switzerland have lifted or substantially eased their Syria sanctions as well.

The measures that remain are targeted at specific individuals and entities tied to the former regime; they are not country-wide and do not call for blocking Syrian IP ranges.

Primary source documents (Executive Order, OFAC and BIS final rules, the joint Treasury/State/Commerce Tri-Seal Advisory, Federal Register notice) are collected at https://unblocksyria.com/resources.

Related Issues

None. Happy to open one first if you prefer to discuss before merging.

Changes Made

• Removed "SY", // Syria from blockedCountries in p2p/p2p.go.

Checklist

• I have tested the changes locally and verified they work as intended.
• I have appropriately titled my branch issue-#<issue-number>.
• I have run re-built the web-wallet and/or block explorer (if applicable). — not applicable
• I have run npm run prettier to format the web-wallet and/or block explorer (if applicable) — not applicable
• I have updated documentation (if applicable). — no docs reference this list
• I have included tests for the changes (if applicable). — no existing tests cover this list

Additional Notes

This is a one-line data change with no logic changes. If the list is maintained for reasons other than US sanctions compliance, could you let me know which regulation or policy the Syria entry is based on?

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