Simplified luci-app-cdn-cache Makefile to use standard LuCI.mk template
instead of custom Package definition. This allows the package to build
correctly with the local-build.sh script and SDK.
The luci.mk template automatically handles installation of files from
the root/ and htdocs/ directories, so custom install directives are
not needed.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
