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/loki/compose.yml

@@ -0,0 +1,27 @@
+services:
+  loki:
+    image: grafana/loki:latest
+    container_name: loki
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:3100:3100"
+    volumes:
+      - loki_data:/loki
+      - loki_config:/etc/loki
+    command: -config.file=/etc/loki/config.yml
+    networks:
+      - monitoring
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:3100/ready"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 30s
+
+volumes:
+  loki_data:
+  loki_config:
+
+networks:
+  monitoring:
+    driver: bridge