feat: Add Cloudflare Workers support

[biplavbarua]

Cloudflare Workers Support

Description

This PR enables github-readme-stats to be deployed on Cloudflare Workers.

This is a strategic addition to address the "Deployment Paused" issues caused by Vercel's free tier limits. Cloudflare Workers provides 100,000 requests/day on its free tier, offering a robust alternative for the community.

Changes

• New Adapter Layer (src/common/adapter.js): Translates standard Request/Response objects to the Express-style req/res expected by existing handlers.
• Worker Entry Point (src/worker.js): Handles routing and dispatches requests to the card generators using the adapter.
• Wrangler Config (wrangler.toml): Configuration for Cloudflare deployment, using the nodejs_compat compatibility flag.
• JSON Imports: Updated gist.js and wakatime.js to use standard ES imports for JSON, replacing createRequire to support modern bundling.

Verification

• Verified locally using wrangler dev (port 8787).
• Confirmed that routing to /api works and invokes the stats fetcher (returning error SVG when tokens are missing, which proves execution path).
• Existing tests passed.

How to Test

1. npm install
2. npm install -D wrangler (if not present)
3. npx wrangler dev
4. Access http://localhost:8787/api?username=anuraghazra

Closes # (if applicable)

[vercel]

@biplavbarua is attempting to deploy a commit to the github readme stats Team on Vercel.

A member of the Team first needs to authorize it.