Add native libs (Edge TPU, flatbuffers) and install script

lib/aarch64/:
- libedgetpu.so.1.0 — custom build for Debian Trixie/Python 3.13
  (built from source with flatbuffers v23 headers, gold linker)
- libflatbuffers.so.24.3.25 — required by libedgetpu

install.sh: one-command setup on fresh Pi
- System packages, native libs, udev rules, venv, systemd service
- Installs setuptools<70 for webrtcvad pkg_resources compat
- Installs ai-edge-litert + resemblyzer

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

install.sh

@@ -0,0 +1,75 @@
+#!/bin/bash
+set -e
+
+echo "[install] HeadMic — Vixy's Ears"
+echo "[install] Setting up on $(hostname)"
+
+# System packages
+echo "[install] Installing system packages..."
+sudo apt install -y -qq python3-pip python3-venv python3-dev sox alsa-utils \
+    libportaudio2 portaudio19-dev libgl1 2>/dev/null
+
+# Native libs (Edge TPU + flatbuffers)
+ARCH=$(dpkg --print-architecture)
+LIB_DIR="$(dirname "$0")/lib/$ARCH"
+if [ -d "$LIB_DIR" ]; then
+    echo "[install] Installing native libs from $LIB_DIR"
+    sudo cp "$LIB_DIR"/libedgetpu.so.* /usr/lib/aarch64-linux-gnu/ 2>/dev/null || true
+    sudo cp "$LIB_DIR"/libflatbuffers.so.* /usr/lib/aarch64-linux-gnu/ 2>/dev/null || true
+    sudo ln -sf libedgetpu.so.1.0 /usr/lib/aarch64-linux-gnu/libedgetpu.so.1 2>/dev/null || true
+    sudo ln -sf libflatbuffers.so.24.3.25 /usr/lib/aarch64-linux-gnu/libflatbuffers.so 2>/dev/null || true
+    sudo ldconfig
+fi
+
+# udev rules
+echo "[install] Setting up udev rules..."
+echo 'SUBSYSTEM=="usb", ATTR{idVendor}=="2886", ATTR{idProduct}=="001a", MODE="0666"' | sudo tee /etc/udev/rules.d/99-xvf3800.rules > /dev/null
+echo 'SUBSYSTEM=="usb", ATTR{idVendor}=="1a6e", MODE="0666"' | sudo tee /etc/udev/rules.d/99-coral.rules > /dev/null
+echo 'SUBSYSTEM=="usb", ATTR{idVendor}=="18d1", MODE="0666"' | sudo tee -a /etc/udev/rules.d/99-coral.rules > /dev/null
+sudo udevadm control --reload-rules && sudo udevadm trigger
+
+# User groups
+sudo usermod -a -G dialout,audio "$(whoami)" 2>/dev/null || true
+
+# Python venv
+echo "[install] Creating venv and installing dependencies..."
+cd "$(dirname "$0")"
+python3 -m venv .venv
+.venv/bin/pip install -q 'setuptools<70'
+.venv/bin/pip install -q -r requirements.txt
+.venv/bin/pip install -q ai-edge-litert resemblyzer
+
+# Systemd service
+echo "[install] Installing systemd service..."
+cat > /tmp/headmic.service << 'EOF'
+[Unit]
+Description=HeadMic - Vixy's Ears
+After=network.target sound.target
+
+[Service]
+Type=simple
+User=alex
+WorkingDirectory=/home/alex/Projects/headmic
+ExecStart=/home/alex/Projects/headmic/.venv/bin/python -m uvicorn headmic:app --host 0.0.0.0 --port 8446
+Restart=always
+RestartSec=5
+Environment=PYTHONUNBUFFERED=1
+Environment=ALSA_SPEAKER=plughw:Array,0
+Environment=ALSA_SPEAKER_AEC=plughw:Array_1,0
+
+[Install]
+WantedBy=multi-user.target
+EOF
+sudo mv /tmp/headmic.service /etc/systemd/system/
+sudo systemctl daemon-reload
+sudo systemctl enable headmic
+
+# Config directory
+mkdir -p ~/.vixy
+
+echo "[install] Done!"
+echo ""
+echo "  Learn ears:  .venv/bin/python xvf3800.py --learn"
+echo "  Test LEDs:   .venv/bin/python xvf3800.py --test-leds"
+echo "  Start:       sudo systemctl start headmic"
+echo "  Logs:        journalctl -u headmic -f"