Disable lazy.nvim luarocks integration

oxocarbon.nvim published a rockspec, which made lazy.nvim attempt a luarocks
install on every startup: it cloned hererocks, failed the build, raised "Too
many rounds of missing plugins", and cost ~2.2s per launch. Nothing here needs
luarocks.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lua/config/lazy.lua

@@ -30,6 +30,7 @@ require("lazy").setup({
   },
   install = { colorscheme = { "kanagawa-dragon", "habamax" } },
   checker = { enabled = true }, -- automatically check for plugin updates
+  rocks = { enabled = false },
   git = {
     concurrency = 3, -- reduce concurrent git operations (default is higher)
   },