Docs-as-code: full deploy configs, compose stacks, and DR guide

- Add root README and docs/ (architecture, hosts, disaster-recovery, operations)
- Add compose/ for superset, forgejo, lam, cadvisor; unified deploy compose
- Add scripts/deploy (deploy-atc-docker01.sh, container inventory export)
- Add inventory/containers-atc-docker01.json snapshot
- Add config READMEs for kafka and airflow; .env.example; expand .gitignore
- Sync atclab helper scripts; update homepage/superset compose with env support

compose/superset/docker-compose.yaml

@@ -0,0 +1,27 @@
+services:
+  superset:
+    build: .
+    container_name: superset
+    restart: unless-stopped
+    ports:
+      - "8088:8088"
+    env_file:
+      - ../../.env
+    environment:
+      - SUPERSET_SECRET_KEY=${SUPERSET_SECRET_KEY:-change-me}
+      - SUPERSET_LOAD_EXAMPLES=no
+    volumes:
+      - ./superset_config.py:/app/pythonpath/superset_config.py
+      - superset_home:/app/superset_home
+    depends_on:
+      - redis
+
+  redis:
+    image: redis:7
+    container_name: superset_redis
+    restart: unless-stopped
+    ports:
+      - "6379:6379"
+
+volumes:
+  superset_home: