fix(package): include assets/ directory in npm package

The dashboard requires `assets/` (favicon.svg, logo.svg) to be present.
Previously, `package.json`'s `files` array excluded `assets/`, causing missing images in the installed package.
This commit adds `assets/` to the whitelist.

Tested by packing and installing in a clean environment.

Co-authored-by: PR0M3TH3AN <[email protected]>

package.json

@@ -15,6 +15,7 @@
     "src/docs/",
     "skills/",
     "dashboard/",
+    "assets/",
     "torch-config.example.json",
     "README.md"
   ],