Initial standalone vox TTS server extracted from the ttstoy bot cog

Self-contained HTTP service with engine, data, start script, systemd unit,
and documentation. Runs independently of the Discord bot on its fixed port.

vox-tts-server.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=VOX TTS Server
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=owen
+WorkingDirectory=/home/owen/vox-tts-server
+Environment=PORT=33003
+ExecStart=/home/owen/vox-tts-server/start.sh
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target