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

deploy/server/updater/deployment.py

@@ -100,12 +100,12 @@ class Deployment:
             if len(styles) != 1:
                 raise RuntimeError('网站组件的样式构建结果不完整。')
             shutil.copy2(styles[0], stage / 'assets/widget.css')
-        loader = stage / 'dashboard/webclient/chattermate.min.js'
+        loader = stage / 'dashboard/webclient/replypier.min.js'
         loader.parent.mkdir(exist_ok=True)
-        self.run([str(front / 'node_modules/.bin/esbuild'), 'src/webclient/chattermate.js',
+        self.run([str(front / 'node_modules/.bin/esbuild'), 'src/webclient/replypier.js',
                   '--bundle', '--minify', '--format=iife', '--target=es2015', '--loader:.svg=text',
                   '--define:process.env.NODE_ENV="production"',
-                  '--define:__CHATTERMATE_API_URL__=' + json.dumps(self.cfg['public_url'] + '/api/v1'),
+                  '--define:__REPLYPIER_API_URL__=' + json.dumps(self.cfg['public_url'] + '/api/v1'),
                   '--outfile=' + str(loader)], cwd=front)
         # Runtime configuration belongs to this installation, not to the repository.
         live_web = self.root / 'deploy/local/.state/dashboard'