Restructure compose mirror: stacks/ grouped by purpose, not by host

Replaces rocky-docker-lxc/, caddy-vm/, monitoring-vm/, and automation/
with a single stacks/ tree grouped by function (identity-and-security,
platform, media, productivity, dev-tools) - 55 stacks total, every one
a real directory in the private repos today.

Resolves all outstanding drift: adds Wazuh (previously entirely
missing), Firefly III and Postiz (never mirrored), the internal-zone
Caddy instance and the Cron Scheduler's separate NocoDB instance
(both previously conflated with their counterparts under one shared
folder); renames Calibre-Web to calibre-web-automated and splits
Kodi-MariaDB into kodi + mariadb-latest to match what the private
repos actually run now; drops the decommissioned NetBox stack.

Also removes automation/iac/old-content/ and
automation/ansible/old-playbooks/ in the same pass - both folders
were entirely stale content describing a superseded architecture
(GitLab instead of Gitea, HAProxy+mTLS SSO instead of the current
Caddy+Authentik setup), now replaced by docs/iac-pipeline.md.

stacks/dev-tools/ollama/docker-compose.yaml

@@ -0,0 +1,44 @@
+services:
+  ollama:
+    # Uncomment below for GPU support
+    # deploy:
+    #   resources:
+    #     reservations:
+    #       devices:
+    #         - driver: nvidia
+    #           count: 1
+    #           capabilities:
+    #             - gpu
+    volumes:
+      - /path/to/ollama:/root/.ollama
+    # Uncomment below to expose Ollama API outside the container stack
+    ports:
+      - "${HTTP_PORT2}:11434"
+    container_name: ollama
+    pull_policy: always
+    tty: true
+    restart: unless-stopped
+    image: ollama/ollama:latest
+    networks:
+      - openai-net
+
+  open-webui:
+    image: ghcr.io/open-webui/open-webui:latest
+    container_name: open-webui
+    volumes:
+      - /path/to/open-webui:/app/backend/data
+    depends_on:
+      - ollama
+    ports:
+      - "${HTTP_PORT}:8080"
+    environment:
+      - "OLLAMA_BASE_URL=http://ollama:11434"
+    extra_hosts:
+      - host.docker.internal:host-gateway
+    restart: unless-stopped
+    networks:
+      - openai-net
+
+networks:
+  openai-net:
+    external: true