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

backend/tests/services/test_ticket_privacy.py

@@ -1,5 +1,5 @@
 """
-Copyright 2024-2026 ChatterMate
+Copyright 2024-2026 ReplyPier
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -23,7 +23,7 @@ from app.services.ticket_privacy import (
     scrub_outbound,
 )
 
-OWNER_EMAIL = "arun@chattermate.chat"
+OWNER_EMAIL = "arun@replypier.site"
 OWNER_PHONE = "+441234567890"
 
 
@@ -41,7 +41,7 @@ class TestScrubOutbound:
         assert scrub_outbound(text, (OWNER_EMAIL,)) == text
 
     def test_own_email_matched_case_insensitively(self):
-        text = "Your account Arun@ChatterMate.Chat is fixed."
+        text = "Your account Arun@ReplyPier.Site is fixed."
         assert scrub_outbound(text, (OWNER_EMAIL,)) == text
 
     def test_own_phone_survives_reformatting(self):