🛡️ Sentinel: [HIGH] Fix SSRF in CLI executor via secure URL reconstruction

[rschumann]

🚨 Severity: HIGH
💡 Vulnerability: The CLI executor was constructing a remote target URL by directly modifying a parsed URL struct, creating an SSRF vulnerability flagged by gosec's taint analysis.
🎯 Impact: If an attacker can control the remote host URL, they could potentially exploit this to bypass validation and perform Server-Side Request Forgery against internal services.
🔧 Fix: Refactored the URL construction to use a strict url.URL{...} struct literal, explicitly assigning validated components (Scheme, User, Host, Path, RawQuery) and discarding potentially malicious fragments or raw paths. Added security comments.
✅ Verification: Verified by running go test ./... -short and go vet ./... successfully.

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PR created automatically by Jules for task 11965572100424993434 started by @rschumann

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