feat: migrate from lazy.nvim to vim.pack

Replace lazy.nvim plugin manager with Neovim 0.12's native vim.pack API.
All plugin config files rewritten from lazy.nvim spec tables to imperative
require/setup format with explicit vim.keymap.set() calls.

Key changes:
- vim.pack.add() with ~53 plugins in init.lua
- blink.cmp/pairs/download pinned to version tags (vim.version.range)
- PackChanged autocmd for markdown-preview build hook
- Ordered requires: colorscheme → ui → treesitter → completion → lsp → rest
- Plugin setup guards (gitsigns, which-key, blink.cmp) handle deferred
  plugin/ file loading correctly

Net reduction: ~438 lines across 13 files.

1 files changed, 58 insertions, 117 deletions

diff --git a/home/.config/nvim/lua/plugins/search.lua b/home/.config/nvim/lua/plugins/search.lua
index e889c4c..a36cddc 100644
--- a/home/.config/nvim/lua/plugins/search.lua
+++ b/home/.config/nvim/lua/plugins/search.lua
@@ -1,119 +1,60 @@
-return {
-  {
-    "ibhagwan/fzf-lua",
-    branch = "main",
-    keys = {
-      {
-        "<localleader>b",
-        function()
-          require("fzf-lua").buffers()
-        end,
-        desc = "fzf-lua [B]uffers",
-      },
-      {
-        "<localleader>/",
-        function()
-          require("fzf-lua").live_grep()
-        end,
-        desc = "fzf-lua live grep",
-      },
-      {
-        "<localleader>f",
-        function()
-          require("fzf-lua").files()
-        end,
-        desc = "fzf-lua [F]iles",
-      },
-      {
-        "<leader><leader>",
-        function()
-          require("fzf-lua").global()
-        end,
-        desc = "fzf-lua global picker",
-      },
-      {
-        "<localleader>d",
-        function()
-          require("fzf-lua").diagnostics()
-        end,
-        desc = "fzf-lua [D]iagnostics",
-      },
-      {
-        "<localleader>r",
-        function()
-          require("fzf-lua").resume()
-        end,
-        desc = "fzf-lua [R]esume",
-      },
-      {
-        "<localleader>gc",
-        function()
-          require("fzf-lua").git_bcommits()
-        end,
-        mode = "n",
-        desc = "[G]it buffer [C]commits",
-      },
-      {
-        "<localleader>gc",
-        function()
-          require("fzf-lua").git_bcommits_range()
-        end,
-        mode = "v",
-        desc = "[G]it [C]commits for selected range",
-      },
-      {
-        "<localleader>gC",
-        function()
-          require("fzf-lua").git_commits()
-        end,
-        desc = "[G]it (all) [C]commits",
-      },
-      {
-        "<localleader>gb",
-        function()
-          require("fzf-lua").git_branches()
-        end,
-        desc = "[G]it [B]ranches",
-      },
-      {
-        "<localleader>gs",
-        function()
-          require("fzf-lua").git_status()
-        end,
-        desc = "[G]it [S]tatus",
-      },
-      {
-        "<localleader>gS",
-        function()
-          require("fzf-lua").git_stash()
-        end,
-        desc = "[G]it [S]tash",
-      },
+local fzflua = require("fzf-lua")
+fzflua.setup({
+  keymap = {
+    builtin = {
+      true,
+      ["<M-p>"] = "toggle-preview",
     },
-    config = function()
-      local fzflua = require("fzf-lua")
-      fzflua.setup({
-        keymap = {
-          builtin = {
-            true,
-            ["<M-p>"] = "toggle-preview",
-          },
-        },
-        grep = {
-          hidden = true,
-          RIPGREP_CONFIG_PATH = "~/.config/ripgrep/ripgreprc",
-        },
-        lsp = {
-          includeDeclaration = false,
-        },
-        actions = {
-          files = {
-            true,
-            ["ctrl-x"] = fzflua.actions.file_split,
-          },
-        },
-      })
-      fzflua.register_ui_select()
-    end,
   },
-}
+  grep = {
+    hidden = true,
+    RIPGREP_CONFIG_PATH = "~/.config/ripgrep/ripgreprc",
+  },
+  lsp = {
+    includeDeclaration = false,
+  },
+  actions = {
+    files = {
+      true,
+      ["ctrl-x"] = fzflua.actions.file_split,
+    },
+  },
+})
+fzflua.register_ui_select()
+
+vim.keymap.set("n", "<localleader>b", function()
+  fzflua.buffers()
+end, { desc = "fzf-lua [B]uffers" })
+vim.keymap.set("n", "<localleader>/", function()
+  fzflua.live_grep()
+end, { desc = "fzf-lua live grep" })
+vim.keymap.set("n", "<localleader>f", function()
+  fzflua.files()
+end, { desc = "fzf-lua [F]iles" })
+vim.keymap.set("n", "<leader><leader>", function()
+  fzflua.global()
+end, { desc = "fzf-lua global picker" })
+vim.keymap.set("n", "<localleader>d", function()
+  fzflua.diagnostics()
+end, { desc = "fzf-lua [D]iagnostics" })
+vim.keymap.set("n", "<localleader>r", function()
+  fzflua.resume()
+end, { desc = "fzf-lua [R]esume" })
+vim.keymap.set("n", "<localleader>gc", function()
+  fzflua.git_bcommits()
+end, { desc = "[G]it buffer [C]commits" })
+vim.keymap.set("v", "<localleader>gc", function()
+  fzflua.git_bcommits_range()
+end, { desc = "[G]it [C]commits for selected range" })
+vim.keymap.set("n", "<localleader>gC", function()
+  fzflua.git_commits()
+end, { desc = "[G]it (all) [C]commits" })
+vim.keymap.set("n", "<localleader>gb", function()
+  fzflua.git_branches()
+end, { desc = "[G]it [B]ranches" })
+vim.keymap.set("n", "<localleader>gs", function()
+  fzflua.git_status()
+end, { desc = "[G]it [S]tatus" })
+vim.keymap.set("n", "<localleader>gS", function()
+  fzflua.git_stash()
+end, { desc = "[G]it [S]tash" })