feat(web): integrate localized application catalogs

- compose app, UI, and independently imported block catalogs from JSON configuration\n- persist the selected locale on the server and activate it without hydration flicker\n- add a flag-based language switcher and localized navigation descriptors\n- mount the redesigned i18n devtool only in development\n- regenerate English and Simplified Chinese catalogs and add switcher coverage

apps/web/vitest.config.ts

@@ -0,0 +1,16 @@
+import path from "node:path"
+import react from "@vitejs/plugin-react"
+import { defineConfig } from "vitest/config"
+
+export default defineConfig({
+  plugins: [react()],
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "./src"),
+    },
+    tsconfigPaths: true,
+  },
+  test: {
+    environment: "jsdom",
+  },
+})