chore: project scaffolding — Docker, nginx, dependencies

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

backend/Dockerfile

@@ -0,0 +1,23 @@
+FROM nvidia/cuda:12.4.1-runtime-ubuntu22.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV PYTHONUNBUFFERED=1
+
+# System dependencies
+RUN apt-get update && apt-get install -y \
+    python3.11 python3.11-venv python3-pip \
+    ffmpeg \
+    libpango-1.0-0 libpangocairo-1.0-0 libgdk-pixbuf2.0-0 \
+    libffi-dev libcairo2 \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN ln -sf /usr/bin/python3.11 /usr/bin/python
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN python -m pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]