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/searxng/README.md

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+# SearXNG
+
+🔍 Privacy Meta Search Engine
+
+## Deploy in Komodo
+
+**Pfad:** `stacks/searxng/`
+
+## Ports
+
+- `8080` - Web UI
+
+## Caddy
+
+```caddyfile
+search.example.com {
+    reverse_proxy localhost:8080
+}
+```
+
+## Notes
+
+- Sucht in mehreren Suchmaschinen gleichzeitig
+- Keine Trackung der Suchanfragen

stacks/searxng/compose.yml

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+services:
+  searxng:
+    image: searxng/searxng:latest
+    container_name: searxng
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:8080:8080"
+    volumes:
+      - searxng_config:/etc/searxng
+    environment:
+      - SEARXNG_BASE_URL=https://searxng.example.com
+    networks:
+      - searxng-network
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/healthz"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 30s
+
+volumes:
+  searxng_config:
+
+networks:
+  searxng-network:
+    driver: bridge

stacks/searxng/stack.toml

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+[[stacks]]
+name = "searxng"
+description = "Privacy Meta Search Engine"
+compose_path = "compose.yml"