feat: Add 10 new stacks (Batch 1)

Added stacks:
- ntfy (Push notifications)
- promtail (Log collector)
- loki (Log aggregation)
- forgejo (Git server)
- immich (Photo backup)
- wireguard (VPN)
- portainer (Docker UI)

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

stacks/forgejo/README.md

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+# Forgejo
+
+🔨 Git Server (Gitea Fork)
+
+## Deploy in Komodo
+
+**Pfad:** `stacks/forgejo/`
+
+## Ports
+
+- `3000` - Web UI
+- `2222` - SSH (externer Port)
+
+## Caddy
+
+```caddyfile
+git.example.com {
+    reverse_proxy localhost:3000
+}
+```

stacks/forgejo/compose.yml

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+services:
+  forgejo:
+    image: codeberg.org/forgejo/forgejo:latest
+    container_name: forgejo
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:3000:3000"
+      - "127.0.0.1:2222:22"
+    volumes:
+      - forgejo_data:/data
+      - forgejo_config:/etc/forgejo
+    environment:
+      - USER_UID=1000
+      - USER_GID=1000
+    networks:
+      - forgejo-network
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:3000/api/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 30s
+
+volumes:
+  forgejo_data:
+  forgejo_config:
+
+networks:
+  forgejo-network:
+    driver: bridge

stacks/forgejo/stack.toml

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+[[stacks]]
+name = "forgejo"
+description = "Git Server (Gitea Fork)"
+compose_path = "compose.yml"