🛡️ Sentinel: [HIGH] Fix Auth Bypass via Token Blacklist

[Magnopiro-oficial]

🚨 Severity: HIGH
💡 Vulnerability: Insecure Session Management / Auth Bypass. The application was verifying JWT signatures but failing to check the token blacklist (Redis), allowing revoked tokens (e.g., after logout) to continue accessing protected endpoints until expiration.
🎯 Impact: An attacker (or a user on a shared device) could use a stolen or logged-out token to access sensitive user data (/me, /users/*) or perform actions (2fa setup) even after the user explicitly logged out.
🔧 Fix: Introduced a centralized authenticate middleware in backend/src/shared/middleware/auth.middleware.ts that enforces AuthService.isTokenBlacklisted(token). Refactored auth.routes.ts and user.routes.ts to use this middleware instead of raw jwtVerify.
✅ Verification:

1. Ran npm run build in backend/ -> Passed.
2. Ran npm test in backend/ (after adding jest.config.js and jest.setup.js and unit tests) -> Passed.
3. Unit tests confirm that authenticate returns 401 if isTokenBlacklisted returns true.

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PR created automatically by Jules for task 2451513121567140727 started by @Magnopiro-oficial

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