Add brain memory services and APIs

Introduce the backend pieces for brain memory ingestion, routing, and
system telemetry so the new knowledge workflows can project data into a
brain view. The supporting tests lock in the new behavior and keep the
expanded backend surface stable.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/Dockerfile

@@ -16,6 +16,6 @@ COPY app/ ./app/
 # 创建数据目录
 RUN mkdir -p /data/jarvis/data /data/jarvis/chroma /data/jarvis/uploads
 
-EXPOSE 8000
+EXPOSE 9527
 
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "9527"]