🛡️ Sentinel: [CRITICAL] Fix Server-Side Request Forgery (SSRF)

[mttmcknn]

🚨 Severity: CRITICAL
💡 Vulnerability: Unrestricted use of http.Get() inside addScriptPlugin and addFromDirectURL allows an attacker to make server-side HTTP requests, including hitting cloud metadata APIs (like 169.254.169.254).
🎯 Impact: If exploited, an attacker could extract sensitive infrastructure credentials or data by making requests to internal IPs.
🔧 Fix: Created a safeHTTPClient() using a custom net.Dialer with a Control hook to reject resolved IPs matching known sensitive internal IPs, and replaced http.Get calls to use this custom client.
✅ Verification: Ensured the plugin can still be fetched from GitHub correctly via normal workflows, but direct requests pointing to cloud metadata IPs will throw a dial error.

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PR created automatically by Jules for task 10610290995065135935 started by @himattm

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