Document full application landscape and collect Docker configs

- Add docs/landscape.md and docker-inventory.md with Mermaid architecture
- Add config/docker per host (db02, lake01, kafka01) and objectscale/elastic refs
- Add live architecture page at icons/docs/architecture.html
- Homepage OPS tab: Lakehouse Architecture group with diagram link
- Add scripts/collect/collect-fleet-config.sh to refresh configs from fleet

config/docker/atc-kafka01/README.md

@@ -0,0 +1,7 @@
+# atc-kafka01
+
+- **Kafka broker:** `10.0.21.36:9092` (native install under `/opt/kafka`)
+- **Kafka UI:** Docker — port `9000`
+- **Kafka Connect plugins:** `/opt/kafka-connect` on host
+
+Debezium Connect runs on **atc-lake01:8083**, not on this host.