✨ feat: add nvim-lint for code linting and update auto-install config

lua/plugins/lang/nvim-lint.lua

@@ -0,0 +1,31 @@
+local lint = require('lint')
+
+-- Filetype to linters mapping
+lint.linters_by_ft = {
+    javascript = { 'eslint_d' },
+    typescript = { 'eslint_d' },
+    javascriptreact = { 'eslint_d' },
+    typescriptreact = { 'eslint_d' },
+    dockerfile = { 'hadolint' },
+    vim = { 'vint' },
+    markdown = { 'write_good', 'markdownlint' },
+    text = { 'write_good' },
+    sh = { 'shellcheck' },
+    yaml = { 'actionlint' },
+}
+
+-- Trigger linting on save and buffer events
+vim.api.nvim_create_autocmd({ 'BufWritePost', 'BufReadPost', 'InsertLeave' }, {
+    callback = function()
+        lint.try_lint()
+    end,
+})
+
+-- Setup mason-nvim-lint to auto-install linters
+local auto_install = require('lib.util').get_user_config('auto_install', true)
+local installed_linters = require('plugins.list').linter_sources or {}
+
+require('mason-nvim-lint').setup({
+    ensure_installed = installed_linters,
+    automatic_installation = auto_install,
+})