feat: add Obsidian CLI API service

- Add Docker image for the official Obsidian desktop app and CLI.

- Start Obsidian headlessly with Xvfb and DBus setup.

- Expose a safe structured HTTP command API without shell execution.

- Add JWT-based vault, path, and command authorization.

- Support single-vault and multi-vault container mounts.

- Add TypeScript SDK helpers for Obsidian CLI commands.

- Add n8n community node package with Obsidian operations.

- Add docs, compose config, tests, and production image workflow.

Dockerfile

@@ -0,0 +1,67 @@
+FROM ghcr.io/astral-sh/uv:python3.14-bookworm-slim
+
+ARG OBSIDIAN_VERSION=1.12.7
+ARG TARGETARCH
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    UV_COMPILE_BYTECODE=1 \
+    UV_LINK_MODE=copy \
+    PATH="/app/.venv/bin:/usr/local/bin:${PATH}" \
+    OBSIDIAN_CLI_BIN=obsidian \
+    OBSIDIAN_VAULT_PATH=/vault \
+    OBSIDIAN_API_HOST=0.0.0.0 \
+    OBSIDIAN_API_PORT=8080 \
+    DISPLAY=:99 \
+    XDG_RUNTIME_DIR=/tmp/runtime-obsidian \
+    ELECTRON_DISABLE_SECURITY_WARNINGS=true
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        ca-certificates \
+        curl \
+        dumb-init \
+        xvfb \
+        xauth \
+        dbus-x11 \
+        libasound2 \
+        libatk-bridge2.0-0 \
+        libatk1.0-0 \
+        libatspi2.0-0 \
+        libcairo2 \
+        libcups2 \
+        libdbus-1-3 \
+        libdrm2 \
+        libgbm1 \
+        libgtk-3-0 \
+        libnss3 \
+        libpango-1.0-0 \
+        libx11-xcb1 \
+        libxcb-dri3-0 \
+        libxcomposite1 \
+        libxdamage1 \
+        libxfixes3 \
+        libxkbcommon0 \
+        libxrandr2 \
+    && case "${TARGETARCH:-amd64}" in \
+        amd64) OBSIDIAN_DEB_ARCH=amd64 ;; \
+        arm64) OBSIDIAN_DEB_ARCH=arm64 ;; \
+        *) echo "Unsupported architecture: ${TARGETARCH}" >&2; exit 1 ;; \
+       esac \
+    && curl -fsSL -o /tmp/obsidian.deb "https://github.com/obsidianmd/obsidian-releases/releases/download/v${OBSIDIAN_VERSION}/obsidian_${OBSIDIAN_VERSION}_${OBSIDIAN_DEB_ARCH}.deb" \
+    && apt-get install -y --no-install-recommends /tmp/obsidian.deb \
+    && ln -sf /opt/Obsidian/obsidian-cli /usr/local/bin/obsidian \
+    && rm -rf /tmp/obsidian.deb /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY pyproject.toml ./
+RUN uv sync --no-dev
+
+COPY app ./app
+COPY sdk ./sdk
+COPY scripts ./scripts
+RUN chmod +x /app/scripts/entrypoint.sh /app/scripts/create_jwt.py
+
+EXPOSE 8080
+ENTRYPOINT ["dumb-init", "--"]
+CMD ["/app/scripts/entrypoint.sh"]