v0.1.2: Multi-server architecture + security cleanup

- Implement multi-server Traefik + Sablier architecture
- Add label-based automatic service discovery
- Create separate Sablier stack deployment
- Add remote server deployment workflow (Option 3)
- Add 9 new functions for multi-server management
- Remove deprecated config-templates folder
- Replace hardcoded private data with placeholders
- Update backup timestamp format to YY_MM_DD_hh_mm
- Add markup.yml to .gitignore

Breaking changes:
- Removed Sablier from core docker-compose.yml (now separate stack)
- Config templates moved from config-templates/ to docker-compose/core/
- REQUIRED_VARS now dynamic based on deployment type

docker-compose/sablier/docker-compose.yml

@@ -0,0 +1,24 @@
+services:
+  sablier:
+    image: acouvreur/sablier:1.7.0
+    container_name: sablier
+    restart: unless-stopped
+    networks:
+      - traefik-network
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.sablier.rule=Host(`sablier.{{DUCKDNS_DOMAIN}}`)"
+      - "traefik.http.routers.sablier.entrypoints=websecure"
+      - "traefik.http.routers.sablier.tls=true"
+      - "traefik.http.routers.sablier.tls.certresolver=letsencrypt"
+      - "traefik.http.routers.sablier.middlewares=authelia@file"
+      - "traefik.http.services.sablier.loadbalancer.server.port=10000"
+    command:
+      - start
+      - --provider.name=docker
+
+networks:
+  traefik-network:
+    external: true