feat: Add 7 new stacks (Batch 2)

Added stacks:
- nextcloud-aio (Cloud storage)
- wordpress (CMS)
- searxng (Meta search)
- authentik (SSO provider)
- jellyfin (Media server)

All stacks include:
- compose.yml with proper configuration
- README.md with deployment info
- stack.toml for Komodo Resource Sync

stacks/nextcloud-aio/README.md

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+# Nextcloud AIO
+
+☁️ Cloud Storage & Collaboration
+
+## Deploy in Komodo
+
+**Pfad:** `stacks/nextcloud-aio/`
+
+## Ports
+
+- `8080` - Web UI
+
+## Caddy
+
+```caddyfile
+cloud.example.com {
+    reverse_proxy localhost:8080
+}
+```
+
+## Notes
+
+- All-In-One Image mit Apache, PHP, DB
+- Erster Start dauert länger (Setup)

stacks/nextcloud-aio/compose.yml

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+services:
+  nextcloud-aio:
+    image: nextcloud/all-in-one:latest
+    container_name: nextcloud-aio
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:8080:8080"
+    volumes:
+      - nextcloud_data:/var/www/html
+      - nextcloud_apps:/var/www/html/custom_apps
+    environment:
+      - APACHE_PORT=8080
+      - NEXTCLOUD_DATADIR=/var/www/html/data
+    networks:
+      - nextcloud-network
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/status.php"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 60s
+
+volumes:
+  nextcloud_data:
+  nextcloud_apps:
+
+networks:
+  nextcloud-network:
+    driver: bridge

stacks/nextcloud-aio/stack.toml

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+[[stacks]]
+name = "nextcloud-aio"
+description = "Cloud Storage & Collaboration"
+compose_path = "compose.yml"