chore: move oxfmt ignore to config

Author: bluwy

.oxfmtignore

@@ -4,5 +4,9 @@
   "singleQuote": true,
   "arrowParens": "avoid",
   "quoteProps": "consistent",
-  "experimentalSortPackageJson": false
+  "experimentalSortPackageJson": false,
+  "ignorePatterns": [
+    // Docus MDC content - formatter breaks component syntax
+    "docs/content/**/*.md"
+  ]
 }