Add systemd service configuration

SYSTEMD_SETUP.md

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+# Systemd Service Setup
+
+This guide explains how to set up the Button Refresh Bot as a systemd service on Linux.
+
+## Prerequisites
+
+- Linux system with systemd
+- Node.js installed
+- Bot configured with `.env` file
+
+## Installation Steps
+
+1. **Edit the service file**
+   
+   Open `buttonrefreshbot.service` and update the following:
+   - `User`: Your Linux username (e.g., `michael`)
+   - `Group`: Your Linux group (usually same as username)
+   - `WorkingDirectory`: Full path to the project directory
+   - `EnvironmentFile`: Full path to your `.env` file
+   - `ExecStart`: Full path to `node` executable (find with `which node`)
+
+   Example:
+   ```ini
+   User=michael
+   Group=michael
+   WorkingDirectory=/home/michael/Buttonrefreshbot
+   EnvironmentFile=/home/michael/Buttonrefreshbot/.env
+   ExecStart=/usr/bin/node /home/michael/Buttonrefreshbot/bot.js
+   ```
+
+2. **Copy the service file to systemd directory**
+   
+   ```bash
+   sudo cp buttonrefreshbot.service /etc/systemd/system/
+   ```
+
+3. **Reload systemd daemon**
+   
+   ```bash
+   sudo systemctl daemon-reload
+   ```
+
+4. **Enable the service (start on boot)**
+   
+   ```bash
+   sudo systemctl enable buttonrefreshbot.service
+   ```
+
+5. **Start the service**
+   
+   ```bash
+   sudo systemctl start buttonrefreshbot.service
+   ```
+
+6. **Check service status**
+   
+   ```bash
+   sudo systemctl status buttonrefreshbot.service
+   ```
+
+## Useful Commands
+
+- **View logs**: `sudo journalctl -u buttonrefreshbot.service -f`
+- **Stop service**: `sudo systemctl stop buttonrefreshbot.service`
+- **Restart service**: `sudo systemctl restart buttonrefreshbot.service`
+- **Disable auto-start**: `sudo systemctl disable buttonrefreshbot.service`
+
+## Troubleshooting
+
+- If the service fails to start, check logs: `sudo journalctl -u buttonrefreshbot.service -n 50`
+- Ensure the `.env` file has correct permissions and contains `BOT_TOKEN`
+- Verify Node.js path is correct: `which node`
+- Check file permissions: the service user must have read access to all project files
+