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/extras/ai.lua

@@ -7,6 +7,9 @@
 
 return {
   'ThePrimeagen/99',
+  dependencies = {
+    { 'saghen/blink.compat', version = '2.*' },
+  },
   config = function()
     local _99 = require '99'
     local basename = vim.fs.basename(vim.uv.cwd())
@@ -25,6 +28,9 @@ return {
       completion = {
         source = 'blink', -- blink.cmp is your completion engine
       },
+      -- Default model (set to nil to use provider default)
+      -- Examples: 'opencode/claude-sonnet-4-5', 'claude-sonnet-4-5', 'gpt-4'
+      model = vim.env.NVIM_99_MODEL or 'openrouter/moonshotai/kimi-k2.5',
     }
 
     -- Visual selection → AI replacement