feat(upsnap): add blueprint for Upsnap network monitor (#475)

- Add docker-compose.yml for containerized deployment with health checks and environment variables
- Include template.toml with configuration variables, domain settings, and mount points
- Add upsnap.svg icon for the service visualization

This commit introduces a complete blueprint to simplify deployment of the Upsnap network monitoring tool using Docker.

meta.json

@@ -5126,6 +5126,24 @@
       "networking"
     ]
   },
+  {
+    "id": "upsnap",
+    "name": "Upsnap",
+    "version": "5",
+    "description": "Upsnap is a simple network device monitor and dashboard built on PocketBase.",
+    "logo": "upsnap.svg",
+    "links": {
+      "github": "https://github.com/seriousm4x/upsnap",
+      "website": "https://github.com/seriousm4x/upsnap",
+      "docs": "https://github.com/seriousm4x/upsnap#readme"
+    },
+    "tags": [
+      "network",
+      "monitoring",
+      "dashboard",
+      "self-hosted"
+    ]
+  },
   {
     "id": "uptime-kuma",
     "name": "Uptime Kuma",