🛡️ Sentinel: [HIGH] Refactor and strengthen URL validation logic

[one-more-refactor]

🛡️ Sentinel Security Improvement

• Refactored announcement link validation into src/url.ts.
• Stripped control characters ([\x00-\x1F\x7F]) before parsing URLs with new URL() constructor to prevent parser evasion tricks.
• Allowed only http:, https:, and relative paths (/) while blocking protocol-relative URLs (//).
• Added unit tests in src/url.test.ts.

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PR created automatically by Jules for task 13831369689806800820 started by @one-more-refactor

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