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/shared/store/globalConfig.js

@@ -0,0 +1,73 @@
+import { parseBoolean } from '@chatwoot/utils';
+import { resolveMaximumFileUploadSize } from 'shared/helpers/FileHelper';
+
+const {
+  API_CHANNEL_NAME: apiChannelName,
+  API_CHANNEL_THUMBNAIL: apiChannelThumbnail,
+  APP_VERSION: appVersion,
+  AZURE_APP_ID: azureAppId,
+  BRAND_NAME: brandName,
+  CHATWOOT_INBOX_TOKEN: chatwootInboxToken,
+  CREATE_NEW_ACCOUNT_FROM_DASHBOARD: createNewAccountFromDashboard,
+  DIRECT_UPLOADS_ENABLED: directUploadsEnabled,
+  DISPLAY_MANIFEST: displayManifest,
+  GIT_SHA: gitSha,
+  MAXIMUM_FILE_UPLOAD_SIZE: maximumFileUploadSize,
+  HCAPTCHA_SITE_KEY: hCaptchaSiteKey,
+  INSTALLATION_NAME: installationName,
+  LOGO_THUMBNAIL: logoThumbnail,
+  LOGO: logo,
+  LOGO_DARK: logoDark,
+  PRIVACY_URL: privacyURL,
+  IS_ENTERPRISE: isEnterprise,
+  TERMS_URL: termsURL,
+  WIDGET_BRAND_URL: widgetBrandURL,
+  DISABLE_USER_PROFILE_UPDATE: disableUserProfileUpdate,
+  DEPLOYMENT_ENV: deploymentEnv,
+  ACTIVE_PLATFORM_BANNERS: activePlatformBanners,
+} = window.globalConfig || {};
+
+const state = {
+  apiChannelName,
+  apiChannelThumbnail,
+  appVersion,
+  azureAppId,
+  brandName,
+  chatwootInboxToken,
+  deploymentEnv,
+  createNewAccountFromDashboard,
+  directUploadsEnabled: parseBoolean(directUploadsEnabled),
+  disableUserProfileUpdate: parseBoolean(disableUserProfileUpdate),
+  displayManifest,
+  gitSha,
+  maximumFileUploadSize: resolveMaximumFileUploadSize(maximumFileUploadSize),
+  hCaptchaSiteKey,
+  installationName,
+  logo,
+  logoDark,
+  logoThumbnail,
+  privacyURL,
+  termsURL,
+  widgetBrandURL,
+  isEnterprise: parseBoolean(isEnterprise),
+  activePlatformBanners: activePlatformBanners || [],
+};
+
+export const getters = {
+  get: $state => $state,
+  isOnChatwootCloud: $state => $state.deploymentEnv === 'cloud',
+  isACustomBrandedInstance: $state => $state.installationName !== 'Chatwoot',
+  isAChatwootInstance: $state => $state.installationName === 'Chatwoot',
+};
+
+export const actions = {};
+
+export const mutations = {};
+
+export default {
+  namespaced: true,
+  state,
+  getters,
+  actions,
+  mutations,
+};