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

e2e/src/api/schema.d.ts

@@ -4914,7 +4914,7 @@ export interface components {
          * AIModelType
          * @enum {string}
          */
-        AIModelType: "OPENAI" | "ANTHROPIC" | "DEEPSEEK" | "GOOGLE" | "GOOGLEVERTEX" | "GROQ" | "MISTRAL" | "HUGGINGFACE" | "OLLAMA" | "XAI" | "OPENAI_COMPATIBLE" | "CHATTERMATE";
+        AIModelType: "OPENAI" | "ANTHROPIC" | "DEEPSEEK" | "GOOGLE" | "GOOGLEVERTEX" | "GROQ" | "MISTRAL" | "HUGGINGFACE" | "OLLAMA" | "XAI" | "OPENAI_COMPATIBLE" | "REPLYPIER";
         /** AISetupResponse */
         AISetupResponse: {
             /** Message */