fix: update OpenAPI spec with router field (#32)

docs/components/openresponsesinputmessageitemcontentunion.md

@@ -0,0 +1,35 @@
+# OpenResponsesInputMessageItemContentUnion
+
+
+## Supported Types
+
+### `components.ResponseInputText`
+
+```python
+value: components.ResponseInputText = /* values here */
+```
+
+### `components.OpenResponsesInputMessageItemContentInputImage`
+
+```python
+value: components.OpenResponsesInputMessageItemContentInputImage = /* values here */
+```
+
+### `components.ResponseInputFile`
+
+```python
+value: components.ResponseInputFile = /* values here */
+```
+
+### `components.ResponseInputAudio`
+
+```python
+value: components.ResponseInputAudio = /* values here */
+```
+
+### `components.ResponseInputVideo`
+
+```python
+value: components.ResponseInputVideo = /* values here */
+```
+