Add support for x-position vendor extension and sorting logic

Author: blindaa121

packages/docusaurus-plugin-openapi-docs/src/openapi/openapi.ts

@@ -263,6 +263,7 @@ function createItems(
           jsonRequestBodyExample,
           info: openapiData.info,
         },
+        position: operationObject["x-position"] as number | undefined,
       };
 
       items.push(apiPage);
@@ -509,6 +510,22 @@ function createItems(
       });
   }
 
+  items.sort((a, b) => {
+    // Items with position come first, sorted by position
+    if (a.position !== undefined && b.position !== undefined) {
+      return a.position - b.position;
+    }
+    // Items with position come before items without position
+    if (a.position !== undefined) {
+      return -1;
+    }
+    if (b.position !== undefined) {
+      return 1;
+    }
+    // If neither has position, maintain original order
+    return 0;
+  });
+
   return items as ApiMetadata[];
 }