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/jellyfin/README.md

@@ -0,0 +1,24 @@
+# Jellyfin
+
+🎬 Media Server
+
+## Deploy in Komodo
+
+**Pfad:** `stacks/jellyfin/`
+
+## Ports
+
+- `8096` - Web UI
+
+## Caddy
+
+```caddyfile
+media.example.com {
+    reverse_proxy localhost:8096
+}
+```
+
+## Notes
+
+- Hardware Transcoding: `/dev/dri` mounten
+- Medien-Pfad anpassen (`/media`)