chore(branding): rename "Web Hosting Panel" to "Web Hosting Platform"

Matches the rename in the whp repo now that the Web Hosting Platform
domain is registered. Doc line and a JS comment; no behaviour change.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

WHP_INTEGRATION.md

@@ -2,7 +2,7 @@
 
 ## Overview
 
-This site builder integrates with WHP (Web Hosting Panel) to provide users with a visual site building interface. Users can create HTML pages using a drag-and-drop editor and save them directly to their web hosting account.
+This site builder integrates with WHP (Web Hosting Platform) to provide users with a visual site building interface. Users can create HTML pages using a drag-and-drop editor and save them directly to their web hosting account.
 
 ## Architecture
 

js/whp-integration.js

@@ -1,7 +1,7 @@
 /**
  * WHP Integration for Site Builder
  * Provides save/load functionality via WHP API when running inside
- * the Web Hosting Panel, or standalone fallbacks otherwise.
+ * the Web Hosting Platform, or standalone fallbacks otherwise.
  *
  * WHP mode is detected by the presence of window.WHP_CONFIG, which is
  * injected by the PHP wrapper page.