🛡️ Sentinel: [HIGH] Fix authorization bypass in tickets API

[trcyberoptic]

🚨 Severity: HIGH
💡 Vulnerability: Authorization bypass in tickets API routes where endpoints for updating ticket status, assigning tickets, and performing bulk actions were accessible to any authenticated user, regardless of role.
🎯 Impact: Attackers or regular users without proper access could improperly modify or resolve security tickets, undermining tracking integrity and audit trails.
🔧 Fix: Created a restricted Echo route sub-group with middleware.RequireRole("admin", "analyst") inside RegisterRoutes for restricted endpoints.
✅ Verification: Ran unit tests and ensured that the application builds smoothly.

Additionally documented learnings in the Sentinel journal .jules/sentinel.md.

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PR created automatically by Jules for task 12908063739819613182 started by @trcyberoptic

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