refactor(structure): reorganize monorepo with projects, terraform hierarchy, and strict k8s namespace rules

projects/grabengasse/backend/Dockerfile

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Prevent Python from writing .pyc files and buffer stdout/stderr
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+COPY requirements.txt .
+
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+EXPOSE 8000
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]