Add Vercel Edge deployment for LeetCode Stats Card

[Copilot]

Vercel-ready Edge Function variant added so the service can be hosted on Vercel with parity to the Cloudflare worker.

• New Vercel package: packages/vercel with edge handler using Hono, shared sanitize/headers logic, /api path normalization, and fallback in-memory cache for non-Cloudflare runtimes.
• Demo and docs: Demo HTML/assets bundled via ?raw; README in root and package documents Vercel setup and build command.
• Tests: Vitest config and handler tests ensure demo fallback and SVG generation behavior without external calls.
• Tooling: Vitest dependency uses caret range; generated api/ output ignored in git.

Example (edge handler export):

export const config = { runtime: "edge" };

export default async function handler(request: Request): Promise<Response> {
  return handleRequest(request); // normalizes /api/* to worker routes and serves SVG/demo
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• leetcode.cn
  • Triggering command: /usr/local/bin/node /usr/local/bin/node --conditions node --conditions development /home/REDACTED/work/LeetCode-Stats-Card/LeetCode-Stats-Card/node_modules/.pnpm/tinypool@1.1.1/node_modules/tinypool/dist/index.js/../entry/process.js (dns block)
• leetcode.com
  • Triggering command: /usr/local/bin/node /usr/local/bin/node --conditions node --conditions development /home/REDACTED/work/LeetCode-Stats-Card/LeetCode-Stats-Card/node_modules/.pnpm/tinypool@1.1.1/node_modules/tinypool/dist/index.js/../entry/process.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Vercel Version</issue_title>
<issue_description>Hi How to Create a vercel version of this is that possible?</issue_description>

<agent_instructions>Yes, the core logic is in packages/core, and you can ask the coding agent to add a Vercel version of packages/cloudflare-worker.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@JacobLinCool Yes, the core logic is in [packages/core](https://github.com/JacobLinCool/LeetCode-Stats-Card/tree/main/packages/core), and you can ask the coding agent to add a Vercel version of [packages/cloudflare-worker](https://github.com/JacobLinCool/LeetCode-Stats-Card/tree/main/packages/cloudflare-worker.).

• Fixes Vercel Version #179

---

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Latest commit: 4b4c023

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