Implement Reusable Authentication Gating System

[omharde42]

Implemented an authentication-gating system for GamerZ Hub.

Summary of changes:

1. Reusable Frontend Protection:

   • Created <RequireAuth> component (web/src/components/auth/require-auth.tsx) with Zustand hydration safety to guard private routes.
   • Extended useAuth() hook (web/src/hooks/useAuth.ts) with requireAuth(actionFn, redirectPath) for inline feature gating on public pages.
   • Updated login & register pages (web/src/app/auth/login/page.tsx, web/src/app/auth/register/page.tsx) to validate and preserve redirect target paths safely (preventing open redirects).
   • Applied route protection to settings (web/src/app/settings/page.tsx).

2. Backend Authorization Alignment:

   • Updated Express route definitions for posts (server/src/routes/post.routes.ts) and tournaments (server/src/routes/tournament.routes.ts) to use optionalAuth for public reading/listing while enforcing strict authenticate (HTTP 401) on data-modifying actions.

3. Real-Time Security:

   • Verified Socket.IO handshake JWT authentication in server/src/socket/handlers.ts. All 25 socket authorization unit tests pass cleanly.

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PR created automatically by Jules for task 4006304126101425211 started by @omharde42

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