🛡️ Sentinel: [HIGH] Fix missing RBAC authorization bypass in API endpoints

[trcyberoptic]

🚨 Severity: HIGH
💡 Vulnerability: Missing Role-Based Access Control (RBAC) on sensitive endpoints in settings.go and tickets.go. Authenticated users with lower privileges could bypass UI checks to modify .env configuration files, assign tickets, and apply risk-rules via direct API calls.
🎯 Impact: A low privileged user could fully compromise or disrupt the platform, escalating privileges or corrupting tickets and environment configuration without authorization.
🔧 Fix: Added explicit RBAC middleware via middleware.RequireRole("admin") and middleware.RequireRole("admin", "analyst") to properly enforce constraints on these sensitive administrative routes.
✅ Verification: Tested with make test and confirmed building application runs with no new regressions.

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PR created automatically by Jules for task 13114551259112989934 started by @trcyberoptic

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