[FA-misc] Astro migration works, probably want to touchup the frontend but that can be in Phase 4

fictionarchive-web-astro/astro.config.mjs

@@ -0,0 +1,17 @@
+import { defineConfig } from 'astro/config';
+import svelte from '@astrojs/svelte';
+import tailwindcss from '@tailwindcss/vite';
+import node from '@astrojs/node';
+
+export default defineConfig({
+  output: 'server',  // SSR mode - use prerender = true for static pages
+  adapter: node({
+    mode: 'standalone',
+  }),
+  integrations: [
+    svelte(),
+  ],
+  vite: {
+    plugins: [tailwindcss()],
+  },
+});