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-lake01/docker-compose.yml

@@ -0,0 +1,53 @@
+# Lakehouse compute — atc-lake01 (10.0.21.50)
+# Reconstructed from running containers; use docker network for spark worker DNS.
+version: "3.9"
+
+services:
+  kafka-connect:
+    image: debezium/connect:2.5.4.Final
+    container_name: kafka-connect
+    restart: unless-stopped
+    ports:
+      - "8083:8083"
+    environment:
+      BOOTSTRAP_SERVERS: 10.0.21.36:9092
+      GROUP_ID: "1"
+      CONFIG_STORAGE_TOPIC: connect-configs
+      OFFSET_STORAGE_TOPIC: connect-offsets
+      STATUS_STORAGE_TOPIC: connect-status
+
+  spark-master:
+    image: bitnamilegacy/spark:latest
+    container_name: spark-master
+    restart: unless-stopped
+    environment:
+      SPARK_MODE: master
+      SPARK_RPC_AUTHENTICATION_ENABLED: "no"
+    ports:
+      - "7077:7077"
+      - "8080:8080"
+
+  spark-worker:
+    image: bitnamilegacy/spark:latest
+    container_name: spark-worker
+    restart: unless-stopped
+    depends_on:
+      - spark-master
+    environment:
+      SPARK_MODE: worker
+      SPARK_MASTER_URL: spark://spark-master:7077
+      SPARK_WORKER_MEMORY: 10G
+      SPARK_RPC_AUTHENTICATION_ENABLED: "no"
+
+  trino:
+    image: trinodb/trino:405
+    container_name: trino
+    restart: unless-stopped
+    ports:
+      - "8089:8080"
+
+  # Ad-hoc Spark shell image (optional)
+  spark-temp:
+    image: apache/spark:3.4.0-scala2.12-java11-python3-ubuntu
+    container_name: spark-temp
+    profiles: ["tools"]