🛡️ Sentinel: [HIGH] Fix missing user role in auth

[Magnopiro-oficial]

🚨 Severity: HIGH
💡 Vulnerability: Broken Access Control. The User model lacked a role field, and the JWT payload did not include it, causing all admin authorization checks (e.g., user.role === 'ADMIN') to fail universally.
🎯 Impact: Denial of Service for Admins. No user could perform administrative actions.
🔧 Fix:

1. Added role UserRole @default(USER) to backend/prisma/schema.prisma.
2. Updated AuthService to include role in the JWT payload and login response.
3. Regenerated Prisma Client.
   ✅ Verification:

• Verified schema.prisma contains role field.
• Verified auth.service.ts uses UserRole enum and user.role.
• Ran npm run build in backend/ to confirm type safety.

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PR created automatically by Jules for task 10018601640562131738 started by @Magnopiro-oficial

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