feat: Add final stacks (Batch 3)

Added stacks:
- plex (Media server)
- pterodactyl-panel (Game server management)
- gotosocial (ActivityPub/Fediverse)
- backrest (Backup UI)

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

TOTAL: 21 stacks ready for Komodo deployment!

stacks/backrest/README.md

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+# Backrest
+
+💾 Backup Management UI
+
+## Deploy in Komodo
+
+**Pfad:** `stacks/backrest/`
+
+## Ports
+
+- `8080` - Web UI
+
+## Caddy
+
+```caddyfile
+backup.example.com {
+    reverse_proxy localhost:8080
+}
+```
+
+## Notes
+
+- UI für Restic Backups
+- Backup-Pfad anpassen

stacks/backrest/compose.yml

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+services:
+  backrest:
+    image: ghcr.io/gabm/backrest:latest
+    container_name: backrest
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:8080:8080"
+    volumes:
+      - backrest_config:/config
+      - /backups:/backups
+    networks:
+      - backrest-network
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/api/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+
+volumes:
+  backrest_config:
+
+networks:
+  backrest-network:
+    driver: bridge

stacks/backrest/stack.toml

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+[[stacks]]
+name = "backrest"
+description = "Backup Management UI"
+compose_path = "compose.yml"

stacks/gotosocial/README.md

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+# GoToSocial
+
+🐘 ActivityPub Server (Fediverse)
+
+## Deploy in Komodo
+
+**Pfad:** `stacks/gotosocial/`
+
+## Ports
+
+- `8080` - Web UI & API
+
+## Caddy
+
+```caddyfile
+social.example.com {
+    reverse_proxy localhost:8080
+}
+```
+
+## Notes
+
+- ActivityPub-kompatibel (Mastodon, Pixelfed, etc.)
+- SQLite Datenbank (einfach)

stacks/gotosocial/compose.yml

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+services:
+  gotosocial:
+    image: docker.homeserver.net/gotosocial/gotosocial:latest
+    container_name: gotosocial
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:8080:8080"
+    volumes:
+      - gotosocial_data:/gotosocial
+    environment:
+      - GOTOSOCIAL_HOST=example.com
+      - GOTOSOCIAL_DB_TYPE=sqlite
+    networks:
+      - gotosocial-network
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/api/v1/instance"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 30s
+
+volumes:
+  gotosocial_data:
+
+networks:
+  gotosocial-network:
+    driver: bridge

stacks/gotosocial/stack.toml

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+[[stacks]]
+name = "gotosocial"
+description = "ActivityPub Server (Fediverse)"
+compose_path = "compose.yml"

stacks/plex/README.md

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+# Plex
+
+🎬 Media Server (Commercial)
+
+## Deploy in Komodo
+
+**Pfad:** `stacks/plex/`
+
+## Ports
+
+- `32400` - Web UI & API
+
+## Caddy
+
+```caddyfile
+plex.example.com {
+    reverse_proxy localhost:32400
+}
+```
+
+## Notes
+
+- PLEX_CLAIM Token von plex.tv nötig
+- Hardware Transcoding: `/dev/dri` mounten

stacks/plex/compose.yml

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+services:
+  plex:
+    image: plexinc/pms-docker:latest
+    container_name: plex
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:32400:32400"
+    volumes:
+      - plex_config:/config
+      - plex_transcode:/transcode
+      - /media:/media:ro
+    environment:
+      - PLEX_CLAIM=claim-token-from-plex.tv
+    devices:
+      - /dev/dri:/dev/dri
+    networks:
+      - plex-network
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:32400/identity"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 60s
+
+volumes:
+  plex_config:
+  plex_transcode:
+
+networks:
+  plex-network:
+    driver: bridge

stacks/plex/stack.toml

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+[[stacks]]
+name = "plex"
+description = "Media Server (Commercial)"
+compose_path = "compose.yml"

stacks/pterodactyl-panel/README.md

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+# Pterodactyl Panel
+
+🎮 Game Server Management
+
+## Deploy in Komodo
+
+**Pfad:** `stacks/pterodactyl-panel/`
+
+## Ports
+
+- `8080` - HTTP
+- `8443` - HTTPS
+
+## Caddy
+
+```caddyfile
+panel.example.com {
+    reverse_proxy localhost:8080
+}
+```
+
+## Notes
+
+- Komplexes Setup mit MariaDB + Redis
+- Benötigt Pterodactyl Wings auf Game-Servern

stacks/pterodactyl-panel/compose.yml

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+services:
+  pterodactyl-panel:
+    image: ghcr.io/pterodactyl/panel:latest
+    container_name: pterodactyl-panel
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:8080:80"
+      - "127.0.0.1:8443:443"
+    volumes:
+      - pterodactyl_panel_var:/var/www/pterodactyl/var
+      - pterodactyl_panel_nginx:/etc/ssl/pterodactyl
+    environment:
+      - TRUSTED_PROXIES=*
+    networks:
+      - pterodactyl-network
+    depends_on:
+      - pterodactyl-db
+      - pterodactyl-cache
+
+  pterodactyl-db:
+    image: mariadb:10.5
+    container_name: pterodactyl-db
+    restart: unless-stopped
+    volumes:
+      - pterodactyl_db:/var/lib/mysql
+    environment:
+      - MYSQL_DATABASE=panel
+      - MYSQL_USER=pterodactyl
+      - MYSQL_PASSWORD=pterodactyl
+      - MYSQL_ROOT_PASSWORD=rootpassword
+    networks:
+      - pterodactyl-network
+
+  pterodactyl-cache:
+    image: redis:alpine
+    container_name: pterodactyl-cache
+    restart: unless-stopped
+    volumes:
+      - pterodactyl_cache:/data
+    networks:
+      - pterodactyl-network
+
+volumes:
+  pterodactyl_panel_var:
+  pterodactyl_panel_nginx:
+  pterodactyl_db:
+  pterodactyl_cache:
+
+networks:
+  pterodactyl-network:
+    driver: bridge

stacks/pterodactyl-panel/stack.toml

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+[[stacks]]
+name = "pterodactyl-panel"
+description = "Game Server Management"
+compose_path = "compose.yml"