docs(v3.5.0): update README for integrated mg_dotfiles and security improvements

- Integrated mg_dotfiles as regular directory (not submodule)
- Added .zshrc.local.example template for local configs without secrets
- Added mg_dotfiles/zsh/.zshrc.local to .gitignore to protect API keys
- Updated README to reflect mg_dotfiles integration and new structure
- Added nvim configuration directory with LazyVim setup

mg_dotfiles/nvim/lua/plugins/oil.lua

@@ -0,0 +1,178 @@
+-- Oil.nvim: Edit your filesystem like a buffer
+-- URL: https://github.com/stevearc/oil.nvim
+
+return {
+  "stevearc/oil.nvim",
+
+  -- Load Oil when opening a directory or when using the keymap
+  lazy = false,
+
+  keys = {
+    { "-", "<CMD>Oil<CR>", desc = "Open Oil (parent dir)" },
+    { "<leader>E", "<CMD>Oil --float<CR>", desc = "Open Oil (floating)" },
+  },
+
+  opts = {
+    -- Oil will take over directory buffers (e.g. `vim .` or `:e src/`)
+    default_file_explorer = true,
+
+    -- Restore window options to previous values when leaving an oil buffer
+    restore_win_options = true,
+
+    -- Skip the confirmation popup for simple operations
+    skip_confirm_for_simple_edits = false,
+
+    -- Selecting a new/moved/renamed file or directory will prompt you to save changes first
+    prompt_save_on_select_new_entry = true,
+
+    -- Keymaps in oil buffer. Can be any value that `vim.keymap.set` accepts OR a table of keymap
+    keymaps = {
+      ["g?"] = "actions.show_help",
+      ["<CR>"] = "actions.select",
+      ["<C-s>"] = { "actions.select", opts = { vertical = true }, desc = "Open in vertical split" },
+      ["<C-v>"] = { "actions.select", opts = { horizontal = true }, desc = "Open in horizontal split" },
+      ["<C-t>"] = { "actions.select", opts = { tab = true }, desc = "Open in new tab" },
+      ["<C-p>"] = "actions.preview",
+      ["<C-c>"] = "actions.close",
+      ["<C-r>"] = "actions.refresh",
+      ["-"] = "actions.parent",
+      ["_"] = "actions.open_cwd",
+      ["`"] = "actions.cd",
+      ["~"] = { "actions.cd", opts = { scope = "tab" }, desc = ":tcd to the current oil directory" },
+      ["gs"] = "actions.change_sort",
+      ["gx"] = "actions.open_external",
+      ["g."] = "actions.toggle_hidden",
+      ["g\\"] = "actions.toggle_trash",
+      -- Quick quit
+      ["q"] = "actions.close",
+    },
+
+    -- Set to false to disable all of the above keymaps
+    use_default_keymaps = false,
+
+    view_options = {
+      -- Show files and directories that start with "." by default
+      show_hidden = true,
+      -- This function defines what is considered a "hidden" file
+      is_hidden_file = function(name, bufnr)
+        return vim.startswith(name, ".")
+      end,
+      -- This function defines what will never be shown, even when `show_hidden` is set
+      is_always_hidden = function(name, bufnr)
+        return name == ".." or name == ".git"
+      end,
+      -- Natural sort order for files and directories
+      natural_order = true,
+      case_insensitive = false,
+      sort = {
+        -- sort order can be "asc" or "desc"
+        -- see :help oil-columns to see which columns are sortable
+        { "type", "asc" },
+        { "name", "asc" },
+      },
+    },
+
+    -- Configuration for the floating window in oil.open_float
+    float = {
+      -- Padding around the floating window
+      padding = 2,
+      max_width = 100,
+      max_height = 30,
+      border = "rounded",
+      win_options = {
+        winblend = 0,
+      },
+      -- preview_split: Split direction: "auto", "left", "right", "above", "below".
+      preview_split = "auto",
+      -- This is the config that will be passed to nvim_open_win.
+      -- Change values here to customize the layout
+      override = function(conf)
+        return conf
+      end,
+    },
+
+    -- Configuration for the actions floating preview window
+    preview = {
+      -- Width dimensions can be integers or a float between 0 and 1 (e.g. 0.4 for 40%)
+      -- min_width and max_width can be a single value or a list of mixed integer/float types.
+      max_width = 0.9,
+      -- min_width = {40, 0.4} means "at least 40 columns, or at least 40% of total"
+      min_width = { 40, 0.4 },
+      -- optionally define an integer/float for the exact width of the preview window
+      width = nil,
+      -- Height dimensions can be integers or a float between 0 and 1 (e.g. 0.4 for 40%)
+      max_height = 0.9,
+      min_height = { 5, 0.1 },
+      -- optionally define an integer/float for the exact height of the preview window
+      height = nil,
+      border = "rounded",
+      win_options = {
+        winblend = 0,
+      },
+      -- Whether the preview window is automatically updated when the cursor is moved
+      update_on_cursor_moved = true,
+    },
+
+    -- Configuration for the floating progress window
+    progress = {
+      max_width = 0.9,
+      min_width = { 40, 0.4 },
+      width = nil,
+      max_height = { 10, 0.9 },
+      min_height = { 5, 0.1 },
+      height = nil,
+      border = "rounded",
+      minimized_border = "none",
+      win_options = {
+        winblend = 0,
+      },
+    },
+
+    -- Configuration for the floating SSH window
+    ssh = {
+      border = "rounded",
+    },
+  },
+
+  dependencies = {
+    "nvim-tree/nvim-web-devicons",
+  },
+
+  config = function(_, opts)
+    require("oil").setup(opts)
+
+    -- Custom autocmds for Oil
+    vim.api.nvim_create_autocmd("FileType", {
+      pattern = "oil",
+      callback = function()
+        -- Set local options for oil buffers
+        vim.opt_local.colorcolumn = ""
+        vim.opt_local.signcolumn = "no"
+
+        -- Auto-save when leaving oil buffer with changes
+        vim.api.nvim_create_autocmd("BufLeave", {
+          buffer = 0,
+          callback = function()
+            if vim.bo.modified then
+              vim.cmd("silent! write")
+            end
+          end,
+        })
+      end,
+    })
+
+    -- Global keymap to open Oil in current buffer's directory
+    vim.keymap.set("n", "<leader>-", function()
+      local oil = require("oil")
+      local current_buf = vim.api.nvim_get_current_buf()
+      local current_file = vim.api.nvim_buf_get_name(current_buf)
+
+      if current_file and current_file ~= "" then
+        local dir = vim.fn.fnamemodify(current_file, ":h")
+        oil.open(dir)
+      else
+        oil.open()
+      end
+    end, { desc = "Open Oil in current file's directory" })
+  end,
+}