Load page.json by import, publish via fs, drop cookie auth

The editor no longer round-trips through /api/pages. Each route's
editor/page.tsx imports its own `../page.json` and hands it to
PageEditor as a prop, so the editor opens with the page already in
hand — no fetch, no loading state, no undo history seeded from a
placeholder. Globals still come from app.globals.json.

Publishing moves from `PUT /api/pages` to a `publishPage` server
action that writes the route's page.json with node:fs directly.
The target path is still built from the lib/pages.ts registry rather
than from the caller, so an unknown route key is rejected instead of
escaping app/.

Removes the customer account auth entirely: the httpOnly cookie
session, the /api/account/* handlers, the customer service and
GraphQL documents, the account-* blocks, and the /account/* routes.
The template has no auth, so nothing reads a cookie now.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01STGDvL4X7FhHHnxdRE2ayo

editor.config.tsx

@@ -12,20 +12,11 @@ import searchResultsEditor from '@/components/shopify/search-results.editor';
 import storeAssistantEditor from '@/components/shopify/store-assistant.editor';
 import contentSectionEditor from '@/components/shopify/content-section.editor';
 import policyBodyEditor from '@/components/shopify/policy-body.editor';
-import accountOrdersEditor from '@/components/shopify/account-orders.editor';
-import {
-  accountActivateEditor,
-  accountLoginEditor,
-  accountRecoverEditor,
-  accountRegisterEditor,
-  accountResetEditor,
-} from '@/components/shopify/account-panel.editor';
 
 const categories = {
   navigation: { title: 'Navigation' },
   commerce: { title: 'Commerce' },
   content: { title: 'Content' },
-  account: { title: 'Account' },
 };
 
 /**
@@ -50,12 +41,6 @@ export const appConfig: UserConfig = {
     'store-assistant': storeAssistantEditor,
     'content-section': contentSectionEditor,
     policy: policyBodyEditor,
-    'account-login': accountLoginEditor,
-    'account-register': accountRegisterEditor,
-    'account-recover': accountRecoverEditor,
-    'account-reset': accountResetEditor,
-    'account-activate': accountActivateEditor,
-    'account-orders': accountOrdersEditor,
   } as any,
 };