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

control-portal/Dockerfile

@@ -0,0 +1,16 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app.py .
+COPY templates ./templates
+
+ENV PORTAL_BIND_HOST=0.0.0.0
+ENV PORTAL_BIND_PORT=8088
+
+EXPOSE 8088
+
+CMD ["python", "app.py"]