refactor: improve Docker speech container audio configuration and user permissions

- Update Dockerfile to enhance audio setup and user management
- Modify setup-audio.sh to add robust PulseAudio socket and device checks
- Add proper user and directory permissions for audio and model directories
- Simplify container startup process and improve audio device detection

docker/speech/setup-audio.sh

@@ -1,7 +1,25 @@
 #!/bin/bash
 
-# Wait for PulseAudio to be ready
-sleep 2
+# Wait for PulseAudio socket to be available
+while [ ! -e /run/user/1000/pulse/native ]; do
+    echo "Waiting for PulseAudio socket..."
+    sleep 1
+done
+
+# Test PulseAudio connection
+pactl info || {
+    echo "Failed to connect to PulseAudio server"
+    exit 1
+}
+
+# List audio devices
+pactl list sources || {
+    echo "Failed to list audio devices"
+    exit 1
+}
+
+# Start the wake word detector
+python /app/wake_word_detector.py
 
 # Mute the monitor to prevent feedback
 pactl set-source-mute alsa_output.pci-0000_00_1b.0.analog-stereo.monitor 1