Vendor Chatwoot Vue 3 frontend into frontend/

Copy the Chatwoot (v4.14.0) frontend runnable subset into frontend/ for
customization:
- app/javascript/ (Vue SPA: dashboard, widget, sdk, portal, superadmin)
- app/views/ (ERB templates for vite-plugin-ruby entrypoint resolution)
- app/helpers/, app/assets/ (Rails view helpers, static assets)
- enterprise/ (Enterprise edition frontend overlay)
- config/vite.json, vite.config.ts, bin/vite (Vite-Rails toolchain)
- package.json, pnpm-lock.yaml, tailwind/postcss/eslint configs
- Gemfile, Gemfile.lock (vite_rails gem for bin/vite binstub)

Excluded Rails backend: controllers, models, services, jobs, mailers,
policies, db, lib, spec, public, node_modules.

Update references to the new frontend location:
- .gitignore: exclude frontend build artifacts (node_modules, tmp, packs),
  keep frontend/bin/ and frontend/vendor/ via negation
- backend/scripts/parity_frontend_smoke.sh: CHATWOOT_DIR default
  reference/chatwoot -> ../frontend
- backend/scripts/parity_frontend_browser_smoke.mjs: same default update
- AGENTS.md: add frontend section with Rails/Vite coupling notes
- README: architecture tree includes frontend/

frontend/app/javascript/v3/views/auth/confirmation/Index.vue

@@ -0,0 +1,39 @@
+<script>
+import { DEFAULT_REDIRECT_URL } from 'dashboard/constants/globals';
+import { verifyPasswordToken } from '../../../api/auth';
+import Spinner from 'shared/components/Spinner.vue';
+
+export default {
+  components: { Spinner },
+  props: {
+    confirmationToken: {
+      type: String,
+      default: '',
+    },
+  },
+  mounted() {
+    this.confirmToken();
+  },
+  methods: {
+    async confirmToken() {
+      try {
+        await verifyPasswordToken({
+          confirmationToken: this.confirmationToken,
+        });
+        window.location = DEFAULT_REDIRECT_URL;
+      } catch (error) {
+        window.location = DEFAULT_REDIRECT_URL;
+      }
+    },
+  },
+};
+</script>
+
+<template>
+  <div
+    class="flex items-center justify-center min-h-screen h-full bg-n-background w-full"
+  >
+    <Spinner color-scheme="primary" size="" />
+    <div class="ml-2 text-n-slate-11">{{ $t('CONFIRM_EMAIL') }}</div>
+  </div>
+</template>