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/scripts/build-webclient-prod.ts

@@ -22,18 +22,18 @@ async function buildWebClientProd() {
     process.env.NODE_ENV = 'production'
     
     // Baked DEFAULT base URL. This only sets the fallback; getBaseUrl() still
-    // resolves window.chattermateBaseUrl / window.APP_CONFIG at runtime, so an
+    // resolves window.replypierBaseUrl / window.APP_CONFIG at runtime, so an
     // env change on a deployment needs no rebuild of this artifact.
-    const apiUrl = process.env.VITE_API_URL || 'https://api.chattermate.chat/api/v1'
+    const apiUrl = process.env.VITE_API_URL || 'https://api.replypier.site/api/v1'
     console.log('Using API URL:', apiUrl)
 
-    const sourceFile = resolve(dirname(__dirname), 'src/webclient/chattermate.js')
+    const sourceFile = resolve(dirname(__dirname), 'src/webclient/replypier.js')
 
     await build({
       entryPoints: [sourceFile],
       bundle: true,
       minify: true,
-      outfile: resolve(dirname(__dirname), 'public/webclient/chattermate.min.js'),
+      outfile: resolve(dirname(__dirname), 'public/webclient/replypier.min.js'),
       format: 'iife',
       target: ['es2015'],
       loader: {
@@ -41,14 +41,14 @@ async function buildWebClientProd() {
       },
       define: {
         'process.env.NODE_ENV': '"production"',
-        '__CHATTERMATE_API_URL__': JSON.stringify(apiUrl),
+        '__REPLYPIER_API_URL__': JSON.stringify(apiUrl),
       },
     })
 
     // Copy output to dist/webclient directory
-    const publicWebclientPath = resolve(dirname(__dirname), 'public/webclient/chattermate.min.js')
+    const publicWebclientPath = resolve(dirname(__dirname), 'public/webclient/replypier.min.js')
     const distWebclientDir = resolve(dirname(__dirname), 'dist/webclient')
-    const distWebclientPath = resolve(distWebclientDir, 'chattermate.min.js')
+    const distWebclientPath = resolve(distWebclientDir, 'replypier.min.js')
     
     // Ensure dist/webclient directory exists
     if (!fs.existsSync(distWebclientDir)) {