Add robots.txt and sitemap with correct public routes.

Serve only indexable pages to crawlers and copy the SEO files into the Vite/Docker build output.

Co-authored-by: Cursor <cursoragent@cursor.com>

vite.config.ts

@@ -1,7 +1,20 @@
-import { defineConfig } from 'vite'
-import react from '@vitejs/plugin-react'
+import { copyFileSync } from "node:fs";
+import { resolve } from "node:path";
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+
+function copySeoFiles() {
+  return {
+    name: "copy-seo-files",
+    closeBundle() {
+      const root = resolve(__dirname);
+      const outDir = resolve(root, "dist");
+      copyFileSync(resolve(root, "robots.txt"), resolve(outDir, "robots.txt"));
+      copyFileSync(resolve(root, "sitemap.xml"), resolve(outDir, "sitemap.xml"));
+    },
+  };
+}
 
-// https://vitejs.dev/config/
 export default defineConfig({
-  plugins: [react()],
+  plugins: [react(), copySeoFiles()],
 });