fix(standard-server): optimize withEventMeta to avoid unnecessary proxies event iterator data (#979)

This prevents structuredClone failures on proxy things 
Fixes: #977

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Performance**
* Skips metadata processing when no meaningful event metadata is
present, reducing overhead while preserving existing behavior.
* **Tests**
* Added tests covering cases where metadata should be applied vs.
bypassed to ensure consistent, efficient handling.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: unnoq

packages/standard-server/src/event-iterator/meta.test.ts

@@ -15,3 +15,17 @@ it('get/withEventMeta', () => {
   expect(() => withEventMeta(data, { retry: -1 })).toThrow('Event\'s retry must be a integer and >= 0')
   expect(() => withEventMeta(data, { comments: ['hi\n'] })).toThrow('Event\'s comment must not contain a newline character')
 })
+
+it('withEventMeta only proxy when make sense', () => {
+  const data = { value: 123, meta: undefined }
+
+  expect(withEventMeta(data, { id: '123', retry: 10000, comments: ['hello', 'world'] })).not.toBe(data)
+  expect(withEventMeta(data, { id: '' })).not.toBe(data)
+  expect(withEventMeta(data, { retry: 0 })).not.toBe(data)
+  expect(withEventMeta(data, { comments: [''] })).not.toBe(data)
+
+  expect(withEventMeta(data, {})).toBe(data)
+  expect(withEventMeta(data, { notExists: true } as any)).toBe(data)
+  expect(withEventMeta(data, { id: undefined })).toBe(data)
+  expect(withEventMeta(data, { comments: [] })).toBe(data)
+})

packages/standard-server/src/event-iterator/meta.ts

@@ -7,6 +7,14 @@ const EVENT_SOURCE_META_SYMBOL = Symbol('ORPC_EVENT_SOURCE_META')
 export type EventMeta = Partial<Pick<EventMessage, 'retry' | 'id' | 'comments'>>
 
 export function withEventMeta<T extends object>(container: T, meta: EventMeta): T {
+  if (
+    meta.id === undefined
+    && meta.retry === undefined
+    && !meta.comments?.length
+  ) {
+    return container
+  }
+
   if (meta.id !== undefined) {
     assertEventId(meta.id)
   }