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/app/services/ticket_jira.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.
@@ -15,7 +15,7 @@ limitations under the License.
 
 One-way Jira escalation for native tickets: when enabled, tickets at or
 above the configured priority get a mirrored Jira issue (external_ref_*).
-Native ChatterMate stays the source of truth — nothing syncs back.
+Native ReplyPier stays the source of truth — nothing syncs back.
 """
 
 from typing import Optional
@@ -94,7 +94,7 @@ async def maybe_escalate_to_jira(db, service, ticket: Ticket, settings_row) -> b
         from app.services.jira import JiraService
 
         description_parts = [
-            f"Escalated from ChatterMate ticket {ticket.display_number} "
+            f"Escalated from ReplyPier ticket {ticket.display_number} "
             f"(priority: {ticket.priority}, severity: {ticket.severity or 'n/a'}).",
         ]
         if ticket.ai_summary: