🛡️ Sentinel: [HIGH] Fix SSRF in AddExternalSource

[arumes31]

• 🚨 Severity: HIGH
• 💡 Vulnerability: Server-Side Request Forgery (SSRF) in the AddExternalSource API handler (internal/api/excluded_handlers.go). The handler accepted user-provided URLs without validating if they resolved to internal network addresses before persisting them.
• 🎯 Impact: An attacker could potentially bypass firewall rules and access internal services (e.g., local administrative interfaces, databases, internal APIs) by providing a malicious URL (like http://127.0.0.1/) when creating an external source, which the server would then fetch.
• 🔧 Fix: Added a validation step using security.IsSafeURL() in the AddExternalSource handler to verify that the provided URL is safe and does not resolve to internal IP ranges before allowing the external source to be created.
• ✅ Verification: Added a unit test TestAPIHandler_AddExternalSource in internal/api/excluded_handlers_test.go that explicitly verifies both successful safe URL additions and the rejection of unsafe internal URLs with a 400 Bad Request.

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PR created automatically by Jules for task 12131855462812607939 started by @arumes31

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