chore: remove comments from compiled TypeScript output (#5953)

Add removeComments to tsconfig.json so adminlte.js strips source
comments. Reduces unminified bundle by ~15%. Minified output unaffected.

Based on PR #5953 by @dfsmania.

Co-Authored-By: Diego Smania <diego.smania@gmail.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people