Initial Meterbox commit with boot disk usage metric.

Co-authored-by: Cursor <cursoragent@cursor.com>

Dockerfile

@@ -0,0 +1,33 @@
+# syntax=docker/dockerfile:1
+
+FROM node:22-bookworm AS frontend
+WORKDIR /app/frontend
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci
+COPY frontend/ ./
+RUN npm run build
+
+FROM rust:1-bookworm AS backend
+WORKDIR /app/backend
+COPY backend/Cargo.toml backend/Cargo.lock ./
+RUN mkdir src && echo 'fn main(){}' > src/main.rs && cargo build --release && rm -rf src
+COPY backend/src ./src
+RUN touch src/main.rs && cargo build --release
+
+FROM debian:bookworm-slim
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends ca-certificates vnstat \
+  && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+COPY --from=backend /app/backend/target/release/meterbox /usr/local/bin/meterbox
+COPY --from=frontend /app/frontend/dist /app/frontend/dist
+RUN mkdir -p /app/data
+ENV METERBOX_LISTEN=127.0.0.1:8787 \
+    METERBOX_DB=/app/data/meterbox.db \
+    METERBOX_STATIC=/app/frontend/dist \
+    METERBOX_INTERVAL_SECS=30 \
+    METERBOX_RETENTION_DAYS=90 \
+    METERBOX_BWFLOW_SOCK=/run/bwflow/bwflow.sock
+EXPOSE 8787
+VOLUME ["/app/data"]
+CMD ["meterbox"]