Fix swapped callback and _meta args in prompt registration

The _meta and callback parameters were passed in wrong order to
_createRegisteredPrompt, causing a type error.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: chughtapan

packages/server/src/server/mcp.ts

@@ -940,8 +940,8 @@ export class McpServer {
             title,
             description,
             argsSchema,
+            cb as PromptCallback<StandardSchemaWithJSON | undefined>,
             _meta,
-            cb as PromptCallback<StandardSchemaWithJSON | undefined>
         );
 
         this.setPromptRequestHandlers();