Initial commit: PRU LED firmware and HTTP service

- Combined PRU0 firmware for both mood (56 LED) and jaw (24 LED) strips
- Uses P9_27 and P9_25 (free pins, not HDMI locked)
- Python HTTP service on port 8765
- Named states: idle, listening, responding, pleasure, thinking, playful, commanding, love, sleep
- Setup scripts for fresh BBB deployment

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vixy-leds.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=Vixy LED Service
+After=network.target
+
+[Service]
+Type=simple
+User=root
+WorkingDirectory=/home/debian/vixy-leds
+ExecStart=/usr/bin/python3 /home/debian/vixy-leds/led_service.py
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target