Document full production deploy (creds, Caddy, one-shot script).

Make AI/human redeploys repeatable via DEPLOY.md and npm run deploy.

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -8,7 +8,8 @@
     "build": "next build",
     "start": "next start",
     "lint": "eslint",
-    "sync:firmware": "powershell -ExecutionPolicy Bypass -File ./scripts/sync-firmware.ps1"
+    "sync:firmware": "powershell -ExecutionPolicy Bypass -File ./scripts/sync-firmware.ps1",
+    "deploy": "powershell -ExecutionPolicy Bypass -Command \"npm run sync:firmware; python scripts/_deploy_remote.py\""
   },
   "dependencies": {
     "@radix-ui/react-radio-group": "^1.5.1",