Initialize piNail project with modern piNail2 web controller

RUNBOOK.md

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+# piNail Runbook
+
+Short operational steps for common issues.
+
+## URLs
+- LAN UI: `http://192.168.0.159:5000`
+- Reverse proxy: `https://nail.sethpc.xyz`
+
+## Service control
+- Status: `ssh pinail "sudo systemctl status pinail2"`
+- Restart: `ssh pinail "sudo systemctl restart pinail2"`
+- Enable at boot: `ssh pinail "sudo systemctl enable pinail2"`
+- Logs: `ssh pinail "sudo journalctl -u pinail2 -f"`
+
+## If buttons do not work
+1. Hard refresh browser (`Ctrl+Shift+R` / `Cmd+Shift+R`).
+2. Confirm backend is online in header (`Backend: Online`).
+3. Restart service: `ssh pinail "sudo systemctl restart pinail2"`.
+4. Recheck UI and verify `Last command` line updates after click.
+
+## If heater does not respond
+1. Ensure ON state in UI and watch `Relay` status.
+2. Check thermocouple status (`TC` should be `OK`).
+3. Verify no safety trip banner is active.
+4. Check logs for relay/GPIO errors.
+
+## If temperature is far off target
+1. Use `P Mode = P-on-Error` for stronger tracking.
+2. Click `Reset I` after major setpoint changes.
+3. Start autotune and wait for completion.
+4. If autotune is too aggressive, manually lower `kP`/`kI` and increase `kD`.
+
+## Autotune quick steps
+1. Set desired target temp.
+2. Turn heater ON.
+3. Click `Start Autotune`.
+4. Watch status (`Running heating/cooling`, peak counter).
+5. Wait for `Autotune: Complete`.
+
+## Deploy updated code
+- From this repo: `cd /root/piNail/piNail2 && ./deploy.sh`
+- Then restart: `ssh pinail "sudo systemctl restart pinail2"`