build: move from pnpm to npm

Replace pnpm-lock.yaml with package-lock.json. pnpm-workspace.yaml's
allowBuilds becomes package.json#allowScripts, which npm 11 gates the same way,
listing only the packages actually present in the tree.

docs/setup-guide.md

@@ -23,7 +23,7 @@
 ```bash
 git clone https://github.com/tiennm99/claude-status-webhook.git
 cd claude-status-webhook
-pnpm install
+npm install
 ```
 
 ### 2. Authenticate with Cloudflare
@@ -64,7 +64,7 @@ npx wrangler secret put ADMIN_CHAT_ID
 ### 5. Deploy
 
 ```bash
-pnpm deploy
+npm run deploy
 ```
 
 Note the worker URL from the output (e.g., `https://claude-status-webhook.<your-subdomain>.workers.dev`).
@@ -90,7 +90,7 @@ Replace `<WEBHOOK_SECRET>` with the secret you set in step 4.
 ## Local Development
 
 ```bash
-pnpm dev
+npm run dev
 ```
 
 This starts a local dev server with wrangler that emulates KV and Queues locally. Test with curl: