Sprint 0: Backend, Docker, KI-Layer mit Free/Premium-Trennung

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+# System-Dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+# Python-Dependencies zuerst (Docker Layer Cache)
+COPY backend/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# App-Code
+COPY backend/ .
+
+# Media-Verzeichnis
+RUN mkdir -p /data/media/dogs /data/media/diary /data/media/poison
+
+EXPOSE 8000
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000", "--proxy-headers"]