Initial EVS client + bridge setup

bridge/.env.example

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+WS_HOST=0.0.0.0
+WS_PORT=8765
+WS_PATH=/audio
+ECHO_ENABLED=true
+LOG_LEVEL=INFO
+
+MQTT_ENABLED=true
+MQTT_HOST=homeassistant.local
+MQTT_PORT=1883
+MQTT_USER=
+MQTT_PASSWORD=
+MQTT_BASE_TOPIC=evs
+MQTT_TTS_TOPIC=evs/+/play_pcm16le
+MQTT_STATUS_RETAIN=true
+
+# Optional webhook in Home Assistant:
+# HA settings -> Automations & Scenes -> Webhooks
+HA_WEBHOOK_URL=
+
+SAVE_SESSIONS=true
+SESSIONS_DIR=/data/sessions
+PCM_SAMPLE_RATE=16000