chore: save session state – feature/phase-1 ready to implement

- Update session-context.md with exact resume point for next session
- Update settings.local.json with broader git permissions
- feature/grundstruktur merged to develop
- PAT authentication configured

Version: 0.2.3

backend/Dockerfile

@@ -0,0 +1,6 @@
+FROM python:3.11-slim
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+COPY . .
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]