Add Quartz service for serving Obsidian notes at /notes/

Replaces the custom Go/Vue notes system with Quartz v4, a polished
static site generator for Obsidian vaults. Mounts OBSIDIAN_DIR as the
Quartz content directory and serves it at /notes/ with hot-reload via
`npx quartz build --serve`.

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

quartz/Dockerfile

@@ -0,0 +1,18 @@
+FROM node:22-slim
+
+RUN apt-get update \
+    && apt-get install --yes git gettext-base \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /quartz
+
+ARG QUARTZ_VERSION=v4.4.0
+RUN git clone --depth 1 --branch ${QUARTZ_VERSION} \
+    https://github.com/jackyzha0/quartz.git . \
+    && npm ci
+
+COPY quartz.config.ts.template /quartz/quartz.config.ts.template
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]