feat: Pulsar distribution service (Simulator → Pulsar → Brokers)

- Fix Pulsar: use binary client (port 6650) instead of non-existent REST /produce API
- Add pulsar-client to Dockerfile
- Create pulsar/distribution.py: consumes Pulsar and republishes to MQTT (EMQX/Mosquitto), NGSI-LD (Orion/Stellio), FROST
- Add docker-compose.distribution.yml for the distribution service
- Tested: Messages successfully distributed to EMQX and Orion-LD
- Update session resume

pulsar/Dockerfile

@@ -0,0 +1,5 @@
+FROM python:3.12-slim
+WORKDIR /app
+RUN pip install --no-cache-dir pulsar-client paho-mqtt requests
+COPY distribution.py /app/
+CMD ["python", "distribution.py"]