Add multi-server system monitor with agent/dashboard architecture

Single Flask codebase runs in agent mode (serves /api/stats from local
/proc) or dashboard mode (aggregates local + remote agents). Currently
monitors compute1 (64-core, podman container) and console (16-core,
bare systemd service).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,11 @@
+FROM python:3.11-slim
+
+RUN pip install --no-cache-dir flask gunicorn
+
+WORKDIR /app
+COPY app.py .
+COPY templates/ templates/
+
+EXPOSE 8083
+
+CMD ["gunicorn", "-b", "0.0.0.0:8083", "-w", "1", "--threads", "2", "app:app"]