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/swagger/paths/application/conversation/toggle_priority.yml

@@ -0,0 +1,37 @@
+tags:
+  - Conversations
+operationId: toggle-priority-of-a-conversation
+summary: Toggle Priority
+description: Toggles the priority of conversation
+security:
+  - userApiKey: []
+  - agentBotApiKey: []
+requestBody:
+  required: true
+  content:
+    application/json:
+      schema:
+        type: object
+        required:
+          - priority
+        properties:
+          priority:
+            type: string
+            enum: ['urgent', 'high', 'medium', 'low', 'none']
+            description: 'The priority of the conversation'
+            example: 'high'
+responses:
+  '200':
+    description: Success
+  '401':
+    description: Unauthorized
+    content:
+      application/json:
+        schema:
+          $ref: '#/components/schemas/bad_request_error'
+  '404':
+    description: Conversation not found
+    content:
+      application/json:
+        schema:
+          $ref: '#/components/schemas/bad_request_error'