Initial history collector implementation

Dockerfile

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+FROM python:3.13-slim
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+COPY app ./app
+# SQLite data is mounted at /data; the container remains read-only except for that mount.
+# It runs as root so a freshly-created local bind mount is writable without manual chown.
+EXPOSE 8080
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8080", "--proxy-headers"]