chore(brand): rename the product to ReplyPier

The upstream project name is gone from code, assets, docs and build
output: brand strings, domains (replypier.site and its app/api/docs/help
subdomains), env prefixes, image and network names, the widget's public
JS API (window.ReplyPier, replypierId/BaseUrl/Config/Token), CSS tokens
(--rp-*), file and directory names, and the WordPress plugin package.

- widget loader is now webclient/replypier.min.js; both bundles rebuilt
  from source (backend/assets/widget.{js,css}, frontend/public/webclient)
- NOTICE, llms.txt, CONTRIBUTING, HELP_CENTER_INFRA and config.dev.js
  rewritten rather than string-swapped; the demo config no longer ships
  the previous vendor's Firebase/Razorpay/Google keys
- new migration replypier_ai_model_001 adds REPLYPIER to the managed
  AIModelType and rewrites pre-rename rows
- local compose project, database, role and volume renamed; LOCAL_DEPLOY
  documents carrying the old local data over

frontend/vite.config.ts

@@ -87,9 +87,9 @@ export default defineConfig(({ command, mode }) => {
       // script stays the first script tag and embedded contexts never register.
       injectRegister: false,
       manifest: {
-        name: 'ChatterMate',
-        short_name: 'ChatterMate',
-        description: 'Agent console for ChatterMate — handle customer chats anywhere.',
+        name: 'ReplyPier',
+        short_name: 'ReplyPier',
+        description: 'Agent console for ReplyPier — handle customer chats anywhere.',
         start_url: '/',
         scope: '/',
         display: 'standalone',
@@ -127,7 +127,7 @@ export default defineConfig(({ command, mode }) => {
       '.ngrok.app',
       '.ngrok.io',
       'frontendchat.ngrok.app',
-      '.chattermate.chat',
+      '.replypier.site',
     ],
   },
   publicDir: 'public',