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/elastic/elasticsearch.yml

@@ -0,0 +1,21 @@
+cluster.name: atc-lakehouse
+node.name: atc-elastic
+node.roles: [master, data, ingest, ml, transform]
+path.data: /home/elasticsearch/data
+path.logs: /home/elasticsearch/logs
+network.host: 0.0.0.0
+http.port: 9200
+discovery.type: single-node
+bootstrap.memory_lock: false
+xpack.security.enabled: true
+xpack.security.enrollment.enabled: true
+xpack.security.http.ssl.enabled: true
+xpack.security.http.ssl.keystore.path: certs/http.p12
+xpack.security.transport.ssl.enabled: true
+xpack.security.transport.ssl.keystore.path: certs/transport.p12
+indices.recovery.max_bytes_per_sec: 100mb
+indices.queries.cache.size: 10%
+indices.fielddata.cache.size: 20%
+cluster.routing.allocation.disk.watermark.low: 85%
+cluster.routing.allocation.disk.watermark.high: 90%
+cluster.routing.allocation.disk.watermark.flood_stage: 95%