Add systemd service file for auto-start

- User service file for ~/.config/systemd/user/
- Restarts on failure with 5s delay
- Logs to journald

Install with:
  cp voice-server.service ~/.config/systemd/user/
  systemctl --user daemon-reload
  systemctl --user enable --now voice-server

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

voice-server.service

@@ -0,0 +1,20 @@
+[Unit]
+Description=Voice Server - Local TTS HTTP Service
+Documentation=https://github.com/calcorum/voice-server
+After=network.target sound.target
+
+[Service]
+Type=simple
+WorkingDirectory=/mnt/NV2/Development/voice-server
+Environment=PATH=/mnt/NV2/Development/voice-server/.venv/bin:/usr/bin:/bin
+ExecStart=/mnt/NV2/Development/voice-server/.venv/bin/uvicorn app.main:app --host 0.0.0.0 --port 8888
+Restart=on-failure
+RestartSec=5
+
+# Logging
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=voice-server
+
+[Install]
+WantedBy=default.target