user/neovim: add flutter-tools

modules/user/neovim.nix

@@ -26,6 +26,7 @@ in {
     ];
 
     plugins = with pkgs.vimPlugins; [
+      flutter-tools-nvim
       fzf-vim
       fzf-lsp-nvim
       lualine-nvim

res/config.lua

@@ -269,4 +269,7 @@ require("lsp_signature").setup {
 }
 
 -- LSP/fzf
-require'fzf_lsp'.setup()
+require("fzf_lsp").setup()
+
+-- LSP/flutter
+require("flutter-tools").setup()