ci: fix markdownlint config format error

- Create .markdownlint.json config file
- Update workflow to use file instead of inline JSON

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

Author: shijiashuai

.github/workflows/quality-check.yml

@@ -18,12 +18,7 @@ jobs:
       uses: DavidAnson/markdownlint-cli2-action@v13
       with:
         globs: '**/*.md'
-        config: |
-          {
-            "MD013": false,
-            "MD033": false,
-            "MD041": false
-          }
+        config: '.markdownlint.json'
 
     - name: 验证 .cursorrules 文件格式
       run: |

.markdownlint.json

@@ -0,0 +1,5 @@
+{
+  "MD013": false,
+  "MD033": false,
+  "MD041": false
+}