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/forgejo/compose.yaml

@@ -0,0 +1,19 @@
+# Forgejo (lokaal op atc-docker01) — primaire Git staat op atc-mgt01:3001
+services:
+  forgejo:
+    image: codeberg.org/forgejo/forgejo:14
+    container_name: forgejo
+    restart: always
+    environment:
+      USER_UID: "1000"
+      USER_GID: "1000"
+    ports:
+      - "4002:3000"
+      - "222:22"
+    volumes:
+      - forgejo_data:/data
+      - /etc/localtime:/etc/localtime:ro
+
+volumes:
+  forgejo_data:
+    name: forgejo_forgejo