Add one-command install script and stability fixes

- Add install.sh for automated setup
- Add all component files (wrapper, service, config, verify)
- Add stability fixes section (WiFi PowerSave disable + Watchdog)
- Update README with new installation instructions

04-sonos-aux.service

@@ -0,0 +1,18 @@
+[Unit]
+Description=Record player AUX stream to Sonos
+After=network-online.target sound.target icecast2.service
+Wants=network-online.target
+StartLimitIntervalSec=0
+StartLimitBurst=0
+
+[Service]
+Type=simple
+User=pi
+Group=audio
+WorkingDirectory=/home/pi
+ExecStart=/home/pi/darkice-wrapper.sh
+Restart=always
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target