Add activity-core LLM endpoint support

Containerfile

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+FROM python:3.12-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    LLM_CONNECT_HOST=0.0.0.0 \
+    LLM_CONNECT_PORT=8080 \
+    LLM_CONNECT_PROVIDER=mock
+
+WORKDIR /app
+
+RUN groupadd -g 10001 llmconnect \
+    && useradd -u 10001 -g 10001 -m -s /usr/sbin/nologin llmconnect
+
+COPY pyproject.toml README.md ./
+COPY llm_connect ./llm_connect
+COPY fixtures ./fixtures
+COPY scripts ./scripts
+
+RUN pip install --no-cache-dir .
+
+USER 10001:10001
+EXPOSE 8080
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD python -c "import json, urllib.request; r=urllib.request.urlopen('http://127.0.0.1:8080/health', timeout=3); raise SystemExit(0 if json.load(r).get('status') == 'ok' else 1)"
+
+CMD ["python", "-m", "llm_connect.server"]