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/dashboard/composables/useConfig.js

@@ -0,0 +1,53 @@
+/**
+ * A function that provides access to various configuration values.
+ * @returns {Object} An object containing configuration values.
+ */
+export function useConfig() {
+  const config = window.chatwootConfig || {};
+
+  /**
+   * The host URL of the Chatwoot instance.
+   * @type {string|undefined}
+   */
+  const hostURL = config.hostURL;
+
+  /**
+   * The VAPID public key for web push notifications.
+   * @type {string|undefined}
+   */
+  const vapidPublicKey = config.vapidPublicKey;
+
+  /**
+   * An array of enabled languages in the Chatwoot instance.
+   * @type {string[]|undefined}
+   */
+  const enabledLanguages = config.enabledLanguages;
+
+  /**
+   * Indicates whether the current instance is an enterprise version.
+   * @type {boolean}
+   */
+  const isEnterprise = config.isEnterprise === 'true';
+
+  /**
+   * The name of the enterprise plan, if applicable.
+   * Returns "community" or "enterprise"
+   * @type {string|undefined}
+   */
+  const enterprisePlanName = config.enterprisePlanName;
+
+  /**
+   * Indicates whether inbox webhook events (ENABLE_INBOX_EVENTS) are enabled.
+   * @type {boolean}
+   */
+  const inboxEventsEnabled = config.inboxEventsEnabled === 'true';
+
+  return {
+    hostURL,
+    vapidPublicKey,
+    enabledLanguages,
+    isEnterprise,
+    enterprisePlanName,
+    inboxEventsEnabled,
+  };
+}