chore: settle product naming across app, widget and deployments

One word everywhere: ReplyPier in UI copy, package and image names, the
replypier.site domains (app/api/docs/help), REPLYPIER_* settings and the
--rp-* design tokens.

- public widget API is window.ReplyPier with replypierId / replypierBaseUrl /
  replypierConfig / replypierToken, loader at webclient/replypier.min.js;
  both bundles rebuilt from source
- NOTICE, llms.txt, CONTRIBUTING, HELP_CENTER_INFRA and the demo runtime
  config rewritten; the demo config ships no third-party keys
- migration adds the ReplyPier managed model value to the AI model enum
- local compose project, database, role, volume and Docker network carry the
  same name

frontend/public/config.dev.js

@@ -3,30 +3,27 @@
 // in a page self === window, so window.APP_CONFIG still works.
 self.APP_CONFIG = {
     // API URLs
-    API_URL: "https://devapi.replypier.site/api/v1",
-    WS_URL: "wss://devapi.replypier.site",
-    WIDGET_URL: "https://devapp.replypier.site",
-    
-    // Firebase Configuration
-    FIREBASE_API_KEY: "AIzaSyDTwDgANnBItYx39qm-6shq4cUws6QY4wI",
-    FIREBASE_AUTH_DOMAIN: "replypier-13e0a.firebaseapp.com",
-    FIREBASE_PROJECT_ID: "replypier-13e0a",
-    FIREBASE_MESSAGING_SENDER_ID: "680125690355",
-    FIREBASE_APP_ID: "1:680125690355:web:466f50999a6c91935ae286",
-    FIREBASE_STORAGE_BUCKET: "replypier-13e0a.firebasestorage.app",
-    FIREBASE_MEASUREMENT_ID: "G-7LGB58R2Q7",
-    FIREBASE_VAPID_KEY: "BJKnggErez2qK3AxBhHyEV-EoS9lfcWO1GDXhRwUKIHbT_PH23vhY_8HRIz_KyuC-0gbuViSrtSMiFp7zgyYY4g",
-    
+    API_URL: "http://localhost:8000/api/v1",
+    WS_URL: "ws://localhost:8000",
+    WIDGET_URL: "http://localhost:8000",
+
+    // Firebase Configuration (fill in for your own project; empty disables it)
+    FIREBASE_API_KEY: "",
+    FIREBASE_AUTH_DOMAIN: "",
+    FIREBASE_PROJECT_ID: "",
+    FIREBASE_MESSAGING_SENDER_ID: "",
+    FIREBASE_APP_ID: "",
+    FIREBASE_STORAGE_BUCKET: "",
+    FIREBASE_MEASUREMENT_ID: "",
+    FIREBASE_VAPID_KEY: "",
+
     // Razorpay Checkout
-    RAZORPAY_KEY_ID: "rzp_test_T92OR9gqPBht0N",
-    GTM_ID: "",
+    RAZORPAY_KEY_ID: "",
 
     // Google Fonts API
-    GOOGLE_FONTS_API_KEY: "AIzaSyCTQCSK_ybLEglabeusbyekQGEyvFr2C5o",
-    
-    DEMO_WIDGET_ID: "a6ee36e9-b70e-4b12-8f94-cc5a5b147f26",
+    GOOGLE_FONTS_API_KEY: "",
+
     // Node Environment
     NODE_ENV: "development",
     HOST: "0.0.0.0"
   };
-