feat: Implement Convex authentication including sign-in/sign-up UI, Convex client provider, and backend auth functions.

middleware.ts

@@ -0,0 +1,9 @@
+import { convexAuthNextjsMiddleware } from "@convex-dev/auth/nextjs/server";
+
+export default convexAuthNextjsMiddleware();
+
+export const config = {
+    // The following matcher runs middleware on all routes
+    // except static assets.
+    matcher: ["/((?!.*\\..*|_next).*)", "/", "/(api|trpc)(.*)"],
+};