🛡️ Sentinel: Fix SSRF vulnerability in WebsiteVerificationService

[Pmaster-dev]

🚨 Severity: HIGH
💡 Vulnerability: Server-Side Request Forgery (SSRF) in WebsiteVerificationService when fetching user-supplied URLs.
🎯 Impact: Attackers could target internal infrastructure, loopback services (localhost), or cloud metadata services (169.254.169.254).
🔧 Fix: Implemented isPrivateUrl check to reject loopback addresses, private IP subnets, cloud metadata IPs, and internal domains.
✅ Verification: Added unit tests in WebsiteVerificationService.test.ts and verified with Vitest.

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PR created automatically by Jules for task 12516657295001342760 started by @Pmaster-dev

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