Establish clean homelab infrastructure baseline

Reorganize the brownfield repository, remove retired and generated artifacts, harden ignore rules, and record the GitOps/IaC redesign.

apps/marker/Dockerfile

@@ -0,0 +1,19 @@
+FROM pytorch/pytorch:2.5.1-cuda12.1-cudnn9-runtime
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    PIP_NO_CACHE_DIR=1 \
+    PYTHONUNBUFFERED=1 \
+    TORCH_DEVICE=cuda
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    poppler-utils \
+    libgl1 \
+    libglib2.0-0 \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN pip install --upgrade pip && \
+    pip install marker-pdf fastapi uvicorn python-multipart
+
+EXPOSE 8001
+
+CMD ["marker_server", "--port", "8001"]