feat: add dap support for dart

modules/languages/dart/config.nix

@@ -55,8 +55,12 @@ in {
             on_attach = default_on_attach;
             flags = lsp_flags,
           },
+          ${optionalString cfg.dap.enable ''
+          debugger = {
+            enabled = true,
+          },
+        ''}
         }
-
       '';
     })
   ]);

modules/languages/dart/dart.nix

@@ -49,6 +49,14 @@ in {
       };
     };
 
+    dap = {
+      enable = mkOption {
+        description = "Enable Dart DAP support via flutter-tools";
+        type = types.bool;
+        default = config.vim.languages.enableDAP;
+      };
+    };
+
     flutter-tools = {
       enable = mkOption {
         description = "Enable flutter-tools for flutter support";