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

simulator.py

@@ -817,27 +817,18 @@ def _init_pulsar() -> bool:
     return False
 
 def publish_pulsar(sid: str, sensor: dict, payload: dict) -> bool:
-    """Publie un message sur Pulsar via l'API REST producer."""
+    """Publie un message sur Pulsar via le client Python (port binaire 6650)."""
     stype = sensor["type"]
-    topic = stype  # air-quality, traffic, weather, parking, noise, light
+    topic = f"persistent://public/default/smartcity-{stype}"
     try:
-        import urllib.request, base64
-        # Pulsar REST producer attend du base64
-        body = json.dumps(payload, ensure_ascii=False)
-        b64 = base64.b64encode(body.encode()).decode()
-        msg = {"messages": [{"payload": b64, "properties": {"sensor_id": sid, "source": "simulator"}}]}
-        url = f"{PULSAR_BASE}/admin/v2/persistent/public/default/{topic}/produce"
-        req = urllib.request.Request(
-            url,
-            data=json.dumps(msg).encode(),
-            headers={"Content-Type": "application/json"},
-            method="POST"
-        )
-        with urllib.request.urlopen(req, timeout=8) as resp:
-            return resp.status in (200, 204)
-    except urllib.error.HTTPError as e:
-        print(f"  ⚠️  Pulsar → {e.code}")
-        return False
+        import pulsar
+        # Utiliser le client Pulsar binaire (socket 6650)
+        client = pulsar.Client(f"pulsar://{PULSAR_HOST}:6650")
+        producer = client.create_producer(topic)
+        body = json.dumps(payload, ensure_ascii=False).encode()
+        producer.send(body, properties={"sensor_id": sid, "source": "simulator"})
+        client.close()
+        return True
     except Exception as e:
         print(f"  ⚠️  Pulsar → {e}")
         return False