Add EVS control portal, io_mode switching, and DAC-only speaker path

control-portal/README.md

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+# EVS Control Portal
+
+Web UI to publish EVS MQTT command payloads without manually crafting JSON.
+
+## Features
+
+- Device picker (`evs/<device_id>/command`)
+- Buttons/forms for:
+  - `status`
+  - `mode` (`idle` / `stream`)
+  - `io_mode` (`mic` / `spk`)
+  - `udp_stream` start/stop
+  - `mic_gain` set/up/down
+- Raw JSON publish for advanced commands
+
+## Environment
+
+- `MQTT_HOST` (default `127.0.0.1`)
+- `MQTT_PORT` (default `1883`)
+- `MQTT_USER` (optional)
+- `MQTT_PASSWORD` (optional)
+- `MQTT_BASE_TOPIC` (default `evs`)
+- `PORTAL_BIND_HOST` (default `0.0.0.0`)
+- `PORTAL_BIND_PORT` (default `8088`)
+
+## Build + Run
+
+```bash
+docker build -f control-portal/Dockerfile -t evs-control-portal:latest control-portal
+docker run --rm -p 8088:8088 \
+  -e MQTT_HOST=10.100.3.247 \
+  -e MQTT_PORT=1883 \
+  -e MQTT_BASE_TOPIC=evs \
+  evs-control-portal:latest
+```
+
+Then open:
+
+`http://<host>:8088`
+
+## Portainer Service Example
+
+```yaml
+services:
+  evs-control-portal:
+    image: git.khnm-zimmerling.de/kai/evs-control-portal:latest
+    container_name: evs-control-portal
+    restart: unless-stopped
+    ports:
+      - "8088:8088"
+    environment:
+      MQTT_HOST: "10.100.3.247"
+      MQTT_PORT: "1883"
+      MQTT_USER: ""
+      MQTT_PASSWORD: ""
+      MQTT_BASE_TOPIC: "evs"
+      PORTAL_BIND_HOST: "0.0.0.0"
+      PORTAL_BIND_PORT: "8088"
+```