feat: use remote dev for r2 cache population (#1159)

feat: use remote dev for r2 cache population

Use Wrangler remote dev for remote R2 cache population, ensure the target bucket exists before uploading cache entries, and isolate the helper worker from project config discovery.

Co-authored-by: Victor Berchet <victor@suumit.com>
Co-authored-by: Isaac Rowntree <isaac@rowntree.me>

Author: 3 people

.changeset/fix-r2-cache-upload.md

@@ -0,0 +1,7 @@
+---
+"@opennextjs/cloudflare": minor
+---
+
+Use remote dev for R2 cache population
+
+Using remote dev is not subject to the Cloudflare API rate limit of 1,200 requests per 5 minutes that caused failures for large applications with thousands of prerendered pages.