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.

lua/config/keymaps.lua

@@ -22,8 +22,6 @@ map('n', '<C-k>', '<C-w><C-k>', { desc = 'Move focus to the upper window' })
 -- File explorer
 map('n', '<C-e>', ':Neotree toggle<CR>', { desc = '[E]xplorer (toggle neotree)' })
 
--- LazyGit
-map('n', '<C-g>', '<cmd>LazyGit<CR>', { desc = 'LazyGit' })
 
 -- Telescope live grep (fixed: was using broken <cmd>builtin... syntax)
 map('n', '<C-f>', function()