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/claude-code.lua

@@ -0,0 +1,33 @@
+return {
+  "coder/claudecode.nvim",
+  dependencies = { "folke/snacks.nvim" },
+  opts = {
+    terminal = {
+      split_side = "left",
+      split_width_percentage = 0.30,
+      provider = "snacks",
+    },
+  },
+  keys = {
+    { "<leader>a", nil, desc = "AI/Claude Code" },
+    { "<leader>ac", "<cmd>ClaudeCode<cr>", desc = "Toggle Claude" },
+    { "<leader>af", "<cmd>ClaudeCodeFocus<cr>", desc = "Focus Claude" },
+    { "<leader>ar", "<cmd>ClaudeCode --resume<cr>", desc = "Resume Claude" },
+    { "<leader>aC", "<cmd>ClaudeCode --continue<cr>", desc = "Continue Claude" },
+    { "<leader>am", "<cmd>ClaudeCodeSelectModel<cr>", desc = "Select Claude model" },
+    { "<leader>ab", "<cmd>ClaudeCodeAdd %<cr>", desc = "Add current buffer" },
+    { "<leader>as", "<cmd>ClaudeCodeSend<cr>", mode = "v", desc = "Send to Claude" },
+    {
+      "<leader>as",
+      "<cmd>ClaudeCodeTreeAdd<cr>",
+      desc = "Add file",
+      ft = { "NvimTree", "neo-tree", "oil", "minifiles" },
+    },
+    -- Diff management
+    { "<leader>aa", "<cmd>ClaudeCodeDiffAccept<cr>", desc = "Accept diff" },
+    { "<leader>ad", "<cmd>ClaudeCodeDiffDeny<cr>", desc = "Deny diff" },
+    -- Preserved existing keymaps
+    { "<leader>at", "<cmd>ClaudeCodeContinue<cr>", desc = "Continue recent conversation" },
+    { "<leader>av", "<cmd>ClaudeCodeVerbose<cr>", desc = "Verbose logging" },
+  },
+}