feat(root): add packui setup and clean up init.lua

New Features
- Added explicit setup for packui.

Enhancements
- Consolidated require calls and removed unused plugin entries from lock file.

Bug Fixes
- None.

init.lua

@@ -1,5 +1,8 @@
-require("pack_helper")
-require("keys")
-require("options")
-require("autocmd")
+require('pack_helper')
+require('packui').setup()
+require('keys')
+require('options')
+require('autocmd')
 require('lsp')
+
+