chore: migrate to OpenNext adapter for Cloudflare Pages (Next.js 16 support)

open-next.config.ts

@@ -0,0 +1,9 @@
+import { defineCloudflareConfig } from "@opennextjs/cloudflare";
+
+export default defineCloudflareConfig({
+	// Uncomment to enable R2 cache,
+	// It should be imported as:
+	// `import r2IncrementalCache from "@opennextjs/cloudflare/overrides/incremental-cache/r2-incremental-cache";`
+	// See https://opennext.js.org/cloudflare/caching for more details
+	// incrementalCache: r2IncrementalCache,
+});