refactor(config): use local.lua for machine-specific paths

- Load local.lua at startup and expose via vim.g.cargdev_local
- Update avante.lua to use local config for paths and settings
- Update ideaMap.lua to use IDEA_DIR from local config
- Remove all hardcoded user paths from plugin configs
- Plugins gracefully skip if required local config is missing

lua/cargdev/plugins/leetcode.lua

@@ -1,5 +1,4 @@
 return {
-  --[[ dir = '/Users/carlos/Documents/SSD_Documents/personals/leetcode.nvim', ]]
   "kawre/leetcode.nvim",
   dependencies = {
     "nvim-telescope/telescope.nvim",