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

convex/http.ts

@@ -0,0 +1,8 @@
+import { httpRouter } from "convex/server";
+import { auth } from "./auth";
+
+const http = httpRouter();
+
+auth.addHttpRoutes(http);
+
+export default http;