Add systemd unit file

.github/used-prompts/deploying.md

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+## Overview
+
+Deploy `luxtools` to the personal Fedora server manually—no CI/CD required. The application runs behind Nginx via a reverse proxy and is supervised by `systemd`.
+
+## Prerequisites
+
+- Fedora (server) with SSH access for a user that can `sudo` without a passwordless setup.
+- Nim toolchain installed locally (for `nim`/`nimble`).
+- Server already provisioned with Nim runtime dependencies.
+- Existing Nginx site definition that proxies traffic to the `luxtools` service port (defaults to `127.0.0.1:9000`).
+
+## One-time server setup
+
+1. Create deployment directories on the server:
+	```fish
+	ssh user@server 'sudo mkdir -p /opt/luxtools/bin /opt/luxtools/config && sudo chown ${USER}:${USER} /opt/luxtools -R'
+	```
+2. Copy the `systemd` unit and enable it:
+	```fish
+	printf '%s\n' "[Unit]" \
+	  "Description=luxtools web service" \
+	  "After=network.target" \
+	  "" \
+	  "[Service]" \
+	  "Type=simple" \
+	  "ExecStart=/opt/luxtools/bin/luxtools" \
+	  "Restart=on-failure" \
+	  "RestartSec=5" \
+	  "User=www-data" \
+	  "WorkingDirectory=/opt/luxtools" \
+	  "Environment=LOG_LEVEL=info" \
+	  "" \
+	  "[Install]" \
+	  "WantedBy=multi-user.target" \
+	  | ssh user@server 'sudo tee /etc/systemd/system/luxtools.service'
+
+	ssh user@server 'sudo systemctl daemon-reload && sudo systemctl enable luxtools.service'
+	```
+3. Ensure Nginx reverse proxy points to `127.0.0.1:9000` and reload it once configured:
+	```fish
+	ssh user@server 'sudo systemctl restart nginx'
+	```
+
+## Deployment script
+
+Save the following as `scripts/deploy.fish` (or another preferred location) and make it executable with `chmod +x scripts/deploy.fish`.
+
+```fish
+#!/usr/bin/env fish
+
+set -e
+
+set SERVER user@server
+set TARGET_DIR /opt/luxtools
+set BIN_NAME luxtools
+
+echo 'Building project locally (release)...'
+nimble build -y
+
+echo 'Uploading binary...'
+scp bin/$BIN_NAME $SERVER:$TARGET_DIR/bin/
+
+echo 'Uploading static assets...'
+scp -r src/static $SERVER:$TARGET_DIR/
+
+echo 'Restarting services...'
+ssh $SERVER 'sudo systemctl restart luxtools.service'
+ssh $SERVER 'sudo systemctl restart nginx'
+
+echo 'Deployment finished.'
+```
+
+> The script prompts for the SSH password and any required `sudo` password on the server.
+
+## Manual deployment steps
+
+1. Build the project locally:
+	```fish
+	nimble build -y
+	```
+2. Copy the new build output and static assets:
+	```fish
+	scp bin/luxtools user@server:/opt/luxtools/bin/
+	scp -r src/static user@server:/opt/luxtools/
+	```
+3. Restart the service and, if needed, Nginx:
+	```fish
+	ssh user@server 'sudo systemctl restart luxtools.service'
+	ssh user@server 'sudo systemctl restart nginx'
+	```
+
+## Verification
+
+- Check service status:
+  ```fish
+  ssh user@server 'systemctl status luxtools.service --no-pager'
+  ```
+- Review recent logs:
+  ```fish
+  ssh user@server 'journalctl -u luxtools.service -n 50 --no-pager'
+  ```
+
+## Troubleshooting tips
+
+- If the service fails, run it manually on the server to capture stdout/stderr: `bin/luxtools`.
+- Ensure SELinux contexts allow Nginx to proxy (`setsebool -P httpd_can_network_connect 1`).
+- Validate reverse proxy config: `sudo nginx -t`.

deploy/luxtools.service

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+[Unit]
+Description=luxtools web service
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/opt/luxtools/bin/luxtools
+WorkingDirectory=/opt/luxtools
+Restart=on-failure
+RestartSec=5
+User=luxtools
+Group=luxtools
+Environment=LOG_LEVEL=info
+Environment=PORT=9000
+StandardOutput=journal
+StandardError=journal
+
+[Install]
+WantedBy=multi-user.target