Move pihole from infrastructure to core stack

Changes:
- docker-compose/core/docker-compose.yml: Added pihole service with full Traefik configuration
- docker-compose/infrastructure/docker-compose.yml: Removed pihole service
- docker-compose/dockge/docker-compose.yml.template: Deleted (no longer needed)

Pihole is now part of core infrastructure alongside Traefik, Authelia, and DuckDNS.
This ensures DNS services are always available on the core server.

docker-compose/dockge/docker-compose.yml.template

@@ -1,63 +0,0 @@
-# Dockge Stack
-# Docker Compose Stack Manager
-# Place in /opt/dockge/docker-compose.yml
-
-# RESTART POLICY GUIDE:
-# - unless-stopped: Core infrastructure services that should always run
-# - no: Services with Sablier lazy loading (start on-demand)
-# - See individual service comments for specific reasoning
-
-# Service Access URLs:
-# - Dockge: https://dockge.${DOMAIN}
-
-services:
-  # Dockge - Docker Compose Stack Manager (PRIMARY - preferred over Portainer)
-  # Access at: https://dockge.${DOMAIN}
-  # Stack management interface should always run for container management
-  dockge:
-    image: louislam/dockge:1
-    deploy:
-      resources:
-        limits:
-          cpus: '0.50'
-          memory: 256M
-          pids: 512
-        reservations:
-          cpus: '0.25'
-          memory: 128M
-    container_name: dockge
-    restart: unless-stopped
-    networks:
-      - homelab-network
-      - traefik-network
-    ports:
-      - "5001:5001"  # Optional: direct access
-    volumes:
-      - /var/run/docker.sock:/var/run/docker.sock
-      - /opt/stacks:/opt/stacks  # Dockge manages stacks in this directory
-      - ./data:/app/data
-      - /usr/bin/docker:/usr/bin/docker:ro  # Mount docker binary for CLI access
-    environment:
-      - DOCKGE_STACKS_DIR=/opt/stacks
-      - DOCKGE_ENABLE_CONSOLE=true
-    labels:
-      # TRAEFIK CONFIGURATION
-      # ==========================================
-      # Service metadata
-      - "homelab.category=infrastructure"
-      - "homelab.description=Docker Compose stack manager (PRIMARY)"
-      # Traefik reverse proxy (comment/uncomment to disable/enable)
-      # If Traefik is on a remote server: these labels are NOT USED; 
-      #   configure external yml files in /traefik/dynamic folder instead.
-      - "traefik.enable=true"
-      - "traefik.http.routers.dockge.rule=Host(`dockge.${DOMAIN}`)"
-      - "traefik.http.routers.dockge.entrypoints=websecure"
-      - "traefik.http.routers.dockge.tls.certresolver=letsencrypt"
-      - "traefik.http.routers.dockge.middlewares=authelia@docker"
-      - "traefik.http.services.dockge.loadbalancer.server.port=5001"
-
-networks:
-  homelab-network:
-    external: true
-  traefik-network:
-    external: true