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/obsidian.lua

@@ -0,0 +1,54 @@
+return {
+  "obsidian-nvim/obsidian.nvim",
+  version = "*", -- recommended, use latest release instead of latest commit
+  lazy = false,
+  enabled = function()
+    -- Disable Obsidian when running from Oil Simple (to avoid path issues in Zed context)
+    return not vim.g.disable_obsidian
+  end,
+  dependencies = {
+    -- Required.
+    "nvim-lua/plenary.nvim",
+  },
+  opts = {
+    workspaces = {
+      {
+        name = "GentlemanNotes", -- Name of the workspace
+        path = os.getenv("HOME") .. "/.config/obsidian", -- Path to the notes directory
+      },
+    },
+    completition = {
+      cmp = true,
+    },
+    picker = {
+      -- Set your preferred picker. Can be one of 'telescope.nvim', 'fzf-lua', 'mini.pick' or 'snacks.pick'.
+      name = "snacks.pick",
+    },
+    -- Optional, define your own callbacks to further customize behavior.
+    callbacks = {
+      -- Runs anytime you enter the buffer for a note.
+      enter_note = function(client, note)
+        -- Setup keymaps for obsidian notes
+        vim.keymap.set("n", "gf", function()
+          return require("obsidian").util.gf_passthrough()
+        end, { buffer = note.bufnr, expr = true, desc = "Obsidian follow link" })
+
+        vim.keymap.set("n", "<leader>ch", function()
+          return require("obsidian").util.toggle_checkbox()
+        end, { buffer = note.bufnr, desc = "Toggle checkbox" })
+
+        vim.keymap.set("n", "<cr>", function()
+          return require("obsidian").util.smart_action()
+        end, { buffer = note.bufnr, expr = true, desc = "Obsidian smart action" })
+      end,
+    },
+
+    -- Settings for templates
+    templates = {
+      subdir = "templates", -- Subdirectory for templates
+      date_format = "%Y-%m-%d-%a", -- Date format for templates
+      gtime_format = "%H:%M", -- Time format for templates
+      tags = "", -- Default tags for templates
+    },
+  },
+}