Initial commit: OpenRouter Python SDK

Auto-generated Python SDK for OpenRouter API, providing comprehensive client library with:
- Chat completions and streaming support
- Embeddings API
- Model and provider information
- API key management
- Analytics and usage tracking
- OAuth authentication flows
- Full type hints and error handling

docs/models/openresponseseasyinputmessageroleunion.md

@@ -0,0 +1,29 @@
+# OpenResponsesEasyInputMessageRoleUnion
+
+
+## Supported Types
+
+### `models.OpenResponsesEasyInputMessageRoleUser`
+
+```python
+value: models.OpenResponsesEasyInputMessageRoleUser = /* values here */
+```
+
+### `models.OpenResponsesEasyInputMessageRoleSystem`
+
+```python
+value: models.OpenResponsesEasyInputMessageRoleSystem = /* values here */
+```
+
+### `models.OpenResponsesEasyInputMessageRoleAssistant`
+
+```python
+value: models.OpenResponsesEasyInputMessageRoleAssistant = /* values here */
+```
+
+### `models.OpenResponsesEasyInputMessageRoleDeveloper`
+
+```python
+value: models.OpenResponsesEasyInputMessageRoleDeveloper = /* values here */
+```
+