🛡️ Sentinel: [MEDIUM] Fix DoS risk by adding timeouts to HTTP requests

[mttmcknn]

🚨 Severity: MEDIUM
💡 Vulnerability: http.Get was used, which relies on http.DefaultClient and lacks request timeouts, potentially leading to DoS or resource exhaustion.
🎯 Impact: External requests could hang indefinitely, exhausting resources and causing application instability.
🔧 Fix: Replaced http.Get with a custom http.Client that includes a 10-second timeout.
✅ Verification: Tests passing with go test ./.... Code review confirms http.Get is no longer used for fetching plugins.

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PR created automatically by Jules for task 3981484040873073295 started by @himattm

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