[Feature] Add Cloudflare Worker as deployment option

[Biki-dev]

Summary

This PR adds a detailed, beginner-friendly deployment guide for running the project on Cloudflare Workers with R2-backed Incremental Static Regeneration (ISR). It includes step-by-step instructions for creating the R2 bucket, configuring open-next.config.ts, and the required wrangler.jsonc changes, plus troubleshooting tips for Windows users.

What I changed

• Added/updated Cloudflare Workers deployment doc (docs/Cloudflare_Workers_Deploy.md or README section)
• Included open-next.config.ts examples for enabling R2
• Provided wrangler.jsonc example with r2_buckets binding
• Clarified .dev.vars usage and .env.local guidance
• Listed common errors and fixes (R2 binding, compatibility_date, resvg.wasm Windows issue)

How to test

1. Ensure your Cloudflare account has R2 enabled and a payment method.
2. Create an R2 bucket named next-inc-cache in Cloudflare.
3. Update open-next.config.ts and wrangler.jsonc per the new docs.
4. Run:

   npm install
   npm run deploy
   

Closes #146

[vercel]

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[Biki-dev]

@DayuanJiang pls review

[DayuanJiang]

Thanks again! I’ll review it shortly.

One small suggestion: since the added doc is quite long, it would be nicer as a separate file (easier to read and maintain).

Out of curiosity — have you tried deploying this change on Cloudflare yourself yet?

[Biki-dev]

Out of curiosity — have you tried deploying this change on Cloudflare yourself yet?

Yes i did