🛡️ Sentinel: [HIGH] Fix SSRF vulnerability in plugin downloader

[himattm]

🚨 Severity: HIGH
💡 Vulnerability: SSRF via unvalidated HTTP requests fetching plugins.
🎯 Impact: Attacker could perform network scans or read cloud metadata like 169.254.169.254.
🔧 Fix: Added a custom http.Client with a net.Dialer Control hook to inspect resolved IPs and explicitly block access to 169.254.169.254.
✅ Verification: Run go test ./... and go fmt ./....

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PR created automatically by Jules for task 8865731912009118746 started by @himattm

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