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/helper/specs/inboxFixture.js

@@ -0,0 +1,61 @@
+export default {
+  customFields: {
+    pre_chat_message: 'Share your queries or comments here.',
+    pre_chat_fields: [
+      {
+        label: 'Email Address',
+        name: 'emailAddress',
+        type: 'email',
+        field_type: 'standard',
+        required: false,
+        enabled: false,
+
+        placeholder: 'Please enter your email address',
+      },
+      {
+        label: 'Full Name',
+        name: 'fullName',
+        type: 'text',
+        field_type: 'standard',
+        required: false,
+        enabled: false,
+        placeholder: 'Please enter your full name',
+      },
+      {
+        label: 'Phone Number',
+        name: 'phoneNumber',
+        type: 'text',
+        field_type: 'standard',
+        required: false,
+        enabled: false,
+        placeholder: 'Please enter your phone number',
+      },
+    ],
+  },
+  customAttributes: [
+    {
+      id: 101,
+      attribute_description: 'Order Identifier',
+      attribute_display_name: 'Order Id',
+      attribute_display_type: 'number',
+      attribute_key: 'order_id',
+      attribute_model: 'conversation_attribute',
+      attribute_values: Array(0),
+      created_at: '2021-11-29T10:20:04.563Z',
+    },
+  ],
+  customAttributesWithRegex: [
+    {
+      id: 2,
+      attribute_description: 'Test contact Attribute',
+      attribute_display_name: 'Test contact Attribute',
+      attribute_display_type: 'text',
+      attribute_key: 'test_contact_attribute',
+      attribute_model: 'contact_attribute',
+      attribute_values: Array(0),
+      created_at: '2023-09-20T10:20:04.563Z',
+      regex_pattern: '^w+$',
+      regex_cue: 'It should be a combination of alphabets and numbers',
+    },
+  ],
+};