Move nvim config into nvim/ subdirectory

Prepare repo structure for storing multiple dotfile configs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

nvim/init.lua

@@ -0,0 +1,23 @@
+-- Bootstrap lazy.nvim
+local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
+if not vim.loop.fs_stat(lazypath) then
+  vim.fn.system({
+    "git",
+    "clone",
+    "--filter=blob:none",
+    "https://github.com/folke/lazy.nvim.git",
+    "--branch=stable",
+    lazypath,
+  })
+end
+vim.opt.rtp:prepend(lazypath)
+
+-- Load core config before plugins
+require("config.options")
+require("config.keymaps")
+require("config.autocmds")
+
+-- Setup plugins
+require("lazy").setup("plugins", {
+  change_detection = { notify = false },
+})