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/plugins/telescope.lua

@@ -38,15 +38,8 @@ return {
     vim.keymap.set('n', '<leader>sd', builtin.diagnostics, { desc = '[S]earch [D]iagnostics' })
     vim.keymap.set('n', '<leader>sr', builtin.resume,      { desc = '[S]earch [R]esume' })
     vim.keymap.set('n', '<leader>s.', builtin.oldfiles,    { desc = '[S]earch Recent Files' })
-    vim.keymap.set('n', '<leader><leader>', builtin.buffers, { desc = '[ ] Find existing buffers' })
-
-    -- Fuzzy search inside current buffer
-    vim.keymap.set('n', '<leader>/', function()
-      builtin.current_buffer_fuzzy_find(require('telescope.themes').get_dropdown {
-        winblend = 10,
-        previewer = false,
-      })
-    end, { desc = '[/] Fuzzily search in current buffer' })
+    vim.keymap.set('n', '<leader><leader>', builtin.live_grep,  { desc = '[ ] Live grep (project)' })
+    vim.keymap.set('n', '<leader>/',        builtin.find_files, { desc = '[/] Find files' })
 
     -- Grep only open files
     vim.keymap.set('n', '<leader>s/', function()