feat: add GitHub Actions workflow for automatic Cloudflare Worker deployment

backend/README.md

@@ -52,6 +52,20 @@ cd backend
 bun run deploy
 ```
 
+Pushes to `main` deploy automatically to the Worker's `workers.dev` URL through
+`.github/workflows/deploy-workers.yml`.
+
+Configure these repository secrets under **Settings → Secrets and variables →
+Actions**:
+
+- `CLOUDFLARE_API_TOKEN`: a Cloudflare API token with `Workers Scripts: Edit`,
+  scoped to the deployment account
+- `CLOUDFLARE_ACCOUNT_ID`: the target Cloudflare account ID
+
+Create the token from the Cloudflare dashboard's **Manage Account → Account API
+Tokens** page. Find the account ID on the target account's Cloudflare dashboard
+overview page.
+
 ## Optional auth
 
 Set one of these as Worker secrets:

backend/wrangler.jsonc

@@ -2,6 +2,7 @@
   "$schema": "./node_modules/wrangler/config-schema.json",
   "name": "webmuxd-wisp-demo",
   "main": "src/index.ts",
+  "workers_dev": true,
   "compatibility_date": "2026-03-03",
   "assets": {
     "directory": "../frontend/dist",