use rsbuild instead of vite

src/env.d.ts

@@ -0,0 +1,13 @@
+/// <reference types="@rsbuild/core/types" />
+
+interface ImportMetaEnv {
+  readonly PUBLIC_MAXKB_URL: string
+  readonly PUBLIC_OJ_URL: string
+  readonly PUBLIC_CODE_URL: string
+  readonly PUBLIC_JUDGE0_URL: string
+  readonly PUBLIC_ICONIFY_URL: string
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv
+}