feat(plugins): add git-ai-commit, diffview, and reorganize keymaps

- Add AI-powered commit message generation with git-ai-commit plugin.
- Add diffview for side-by-side git diffs.
- Reorganize telescope keymaps (<leader><leader> for live_grep, <leader>/ for find_files).
- Update lazy.nvim imports to include plugins.extras.
- Add mago.nvim for PHP support.
- Update AI plugin with model configuration.

init.lua

@@ -25,8 +25,11 @@ if not (vim.uv or vim.loop).fs_stat(lazypath) then
 end
 vim.opt.rtp:prepend(lazypath)
 
--- Load all plugin specs from lua/plugins/**/*.lua
-require('lazy').setup('plugins', {
+-- Load all plugin specs from lua/plugins/*.lua and lua/plugins/extras/*.lua
+require('lazy').setup({
+  { import = 'plugins' },
+  { import = 'plugins.extras' },
+}, {
   ui = {
     icons = vim.g.have_nerd_font and {} or {
       cmd     = '⌘',