Scaffold Astro/Strapi monorepo for the site rebuild

Set up a pnpm workspace with apps/site (Astro) and apps/cms (Strapi,
SQLite-backed) as the foundation for the new digital-legacy site.
Switches package management to pnpm and adds Biome for linting/
formatting, replacing npm/no-linter setup. Existing Zola site stays
in place for now and will be migrated/removed progressively.

apps/cms/config/server.ts

@@ -0,0 +1,14 @@
+import type { Core } from '@strapi/strapi';
+
+const config = ({ env }: Core.Config.Shared.ConfigParams): Core.Config.Server => ({
+  host: env('HOST', '0.0.0.0'),
+  port: env.int('PORT', 1337),
+  app: {
+    keys: env.array('APP_KEYS')!,
+  },
+  webhooks: {
+    populateRelations: env.bool('WEBHOOKS_POPULATE_RELATIONS', false),
+  },
+});
+
+export default config;