T3.2: Wire up Next.js middleware for role-based route protection

[Copilot]

Route protection logic existed in proxy.ts but was never invoked — Next.js only recognizes middleware.ts at the project root with a middleware export. All protected routes (/dashboard, /tutor, /admin) were effectively unguarded at the edge.

Changes

• Created middleware.ts — renames proxy.ts → middleware.ts and the exported function from proxy to middleware, making it a valid Next.js edge middleware. Logic is unchanged:
  • Unauthenticated requests to /dashboard/**, /tutor/**, /admin/** → /auth/sign-in?next=<path>
  • Authenticated users hitting /auth/sign-in or /auth/sign-up → /dashboard
• Removed proxy.ts — dead code, never imported or executed
• Updated README.md — corrected repo structure tree and feature status table to reference middleware.ts

Role-specific server-side checks (already implemented) remain in place as the second layer:

• app/dashboard/page.tsx — reads primary_role, redirects admin/tutor to their areas
• app/admin/layout.tsx — verifies admin role via service-role client
• app/tutor/layout.tsx — verifies tutor or admin role via service-role client

Testing

• Verified locally
• Checked key flows manually

Notes

The middleware handles the fast edge-level unauthenticated guard. Fine-grained wrong-role redirects are intentionally handled in Server Components (layouts/pages) where the Supabase service-role client is available.

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[Copilot]

Pull request overview

This PR fixes a critical security issue where route protection logic existed in proxy.ts but was never executed because Next.js only recognizes edge middleware when the function is named middleware and exported from middleware.ts at the project root. The PR renames the file and function to follow Next.js conventions, making the authentication-based route protection operational at the edge.

Changes:

• Renamed proxy.ts to middleware.ts and the exported function from proxy to middleware, activating Next.js edge middleware
• Updated README.md structure tree and feature status table to reference middleware.ts instead of proxy.ts

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
middleware.ts	Renamed function export from proxy to middleware and updated comment to reflect "role-based route protection" instead of mentioning "Next.js 16"
README.md	Updated repo structure tree to include middleware.ts and corrected feature status table entry from "Route protection (proxy)" to "Route protection (middleware)"

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