fix architecture and write new tests

apps/admin/src/middleware.ts

@@ -0,0 +1,17 @@
+import { NextResponse } from 'next/server'
+import type { NextRequest } from 'next/server'
+
+export function middleware(request: NextRequest) {
+  if (request.headers.has('x-middleware-subrequest')) {
+    return new NextResponse('Unsupported internal request header', { status: 400 })
+  }
+
+  return NextResponse.next()
+}
+
+export const config = {
+  matcher: [
+    '/((?!_next|[^?]*\\.(?:html?|css|js(?!on)|jpe?g|webp|png|gif|svg|ttf|woff2?|ico|csv|docx?|xlsx?|zip|webmanifest)).*)',
+    '/(api|trpc)(.*)',
+  ],
+}