fix(region-check): remove Syria from sanctioned countries

[as206em]

Problem

SANCTIONED_COUNTRIES in src/config/providerRegions.ts lists Syria (SY), so isRegionSanctioned and getRestrictedServices tell users in Syria that GitHub, npm and Docker Hub may be unavailable due to trade sanctions. That is out of date: the US Syria sanctions program was terminated by Executive Order 14312 (effective 2025-07-01), OFAC removed the Syrian Sanctions Regulations (31 CFR Part 542) on 2025-08-26, the Caesar Act was repealed on 2025-12-18, and the State Sponsor of Terrorism designation was rescinded on 2026-08-24 (US News). GitHub restored service for Syria in 2025 (community discussion). Source documents: https://unblocksyria.com/resources

Solution

Remove the "SY" entry from SANCTIONED_COUNTRIES. Syrian users no longer get the restricted-services notice; every other entry and all logic are unchanged.

Potential risks

• Docker Hub's current availability in Syria was not verified. If Docker still blocks Syrian IPs, those users lose a warning that would still be accurate for that one service.
• No compatibility, data or persistence impact: the list is a static constant read by useRegionCheck and the settings region notice.

Verification

• Commit made through the repository hooks: lint-staged (oxlint, eslint, prettier) passed, tsgo --noEmit type check passed, trailer reports eslint 0 / circular 0.
• Not run: pnpm test, pnpm lint (full project), and any manual UI check. No existing test references this list.

Submit checklist

• I read and followed .github/PR_RULES.md.
• The PR is focused and has a scoped Conventional Commit title, such as feat(scope): summary or fix(scope): summary.
• I ran the relevant checks, or explained why they were not run.
• No secrets, private config, generated output, or unrelated formatting changes are included.
• Docs, screenshots, and locale updates are included when the change needs them. No UI or copy changes, so none are needed.

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