✨ feat: enhance admin UI configuration and SSR handling

- Add support for number chip arrays and JSON editor in admin UI config.
- Introduce pagebuilder block registry for Svelte components in admin previews.
- Implement custom role names and a 3-layer cascade model for field-level permissions.
- Add CORS configuration hierarchy for better API security.
- Update project setup instructions for admin token and config management.
- Improve SSR 404 signaling with proper context handling in NotFound component.
- Refactor routing structure to separate NotFound page into its own route.

frontend/AGENTS.md

@@ -8,7 +8,7 @@ Svelte 5 SPA bundled with esbuild and styled with Tailwind CSS 4.
 - `src/lib/` — utilities, stores, actions, API layer.
 - `src/widgets/` — reusable UI components (Button, Input, Form, etc.).
 - `src/css/` — global styles and Tailwind imports.
-- Keep route components in a `src/routes/` folder when needed.
+- `src/routes/` — page-level components (e.g. `NotFound.svelte` for the 404 page). Not file-based routing — these are manually imported by `App.svelte`.
 
 ## Routing
 

frontend/src/App.svelte

@@ -7,7 +7,7 @@
     import ToastContainer from "./widgets/ToastContainer.svelte"
     import DebugFooterInfo from "./widgets/DebugFooterInfo.svelte"
     import BlockRenderer from "./blocks/BlockRenderer.svelte"
-    import NotFound from "./blocks/NotFound.svelte"
+    import NotFound from "./routes/NotFound.svelte"
     import { initScrollRestoration } from "./lib/navigation"
     import { getCachedEntries } from "./lib/api"
     import {

frontend/src/routes/NotFound.svelte

@@ -2,6 +2,13 @@
     import { _ } from "../lib/i18n/index"
     import { localizedPath } from "../lib/i18n"
     import { reveal } from "../lib/actions/reveal"
+
+    // Signal HTTP 404 to the SSR hook during server-side rendering.
+    // get_read.js checks context.is404 after render() and returns status 404.
+    if (typeof window === "undefined") {
+        // @ts-ignore - context is the goja global in SSR runtime (declared by tibi-types)
+        context.is404 = true
+    }
 </script>
 
 <section class="min-h-[60vh] flex items-center justify-center bg-gray-50">