fix: inline Supabase middleware to fix Vercel Edge resolution

The @/ path alias was not resolved in Vercel's Edge Function bundler,
causing "unsupported modules" error. Inlined the middleware logic
directly to avoid the import.

https://claude.ai/code/session_01H2aRGDaKgarPvhay2HxN6Y

middleware.ts

@@ -1,17 +1,69 @@
-import { updateSession } from "@/lib/supabase/middleware";
-import type { NextRequest } from "next/server";
+import { createServerClient } from "@supabase/ssr";
+import { NextResponse, type NextRequest } from "next/server";
 
 export async function middleware(request: NextRequest) {
-  return await updateSession(request);
+  let supabaseResponse = NextResponse.next({
+    request,
+  });
+
+  const supabase = createServerClient(
+    process.env.NEXT_PUBLIC_SUPABASE_URL!,
+    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
+    {
+      cookies: {
+        getAll() {
+          return request.cookies.getAll();
+        },
+        setAll(cookiesToSet) {
+          cookiesToSet.forEach(({ name, value }) =>
+            request.cookies.set(name, value)
+          );
+          supabaseResponse = NextResponse.next({
+            request,
+          });
+          cookiesToSet.forEach(({ name, value, options }) =>
+            supabaseResponse.cookies.set(name, value, options)
+          );
+        },
+      },
+    }
+  );
+
+  const {
+    data: { user },
+  } = await supabase.auth.getUser();
+
+  // Rediriger vers login si pas connecte et route protegee
+  if (
+    !user &&
+    (request.nextUrl.pathname.startsWith("/dashboard") ||
+      request.nextUrl.pathname.startsWith("/formations") ||
+      request.nextUrl.pathname.startsWith("/profil"))
+  ) {
+    const url = request.nextUrl.clone();
+    url.pathname = "/login";
+    return NextResponse.redirect(url);
+  }
+
+  // Rediriger vers dashboard si deja connecte et sur login/register
+  if (
+    user &&
+    (request.nextUrl.pathname === "/login" ||
+      request.nextUrl.pathname === "/register")
+  ) {
+    const url = request.nextUrl.clone();
+    url.pathname = "/dashboard";
+    return NextResponse.redirect(url);
+  }
+
+  return supabaseResponse;
 }
 
 export const config = {
   matcher: [
-    // Routes protégées
     "/dashboard/:path*",
     "/formations/:path*",
     "/profil/:path*",
-    // Routes auth (redirection si déjà connecté)
     "/login",
     "/register",
   ],