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/responsesoutputmessagestatusunion.md

@@ -0,0 +1,23 @@
+# ResponsesOutputMessageStatusUnion
+
+
+## Supported Types
+
+### `models.ResponsesOutputMessageStatusCompleted`
+
+```python
+value: models.ResponsesOutputMessageStatusCompleted = /* values here */
+```
+
+### `models.ResponsesOutputMessageStatusIncomplete`
+
+```python
+value: models.ResponsesOutputMessageStatusIncomplete = /* values here */
+```
+
+### `models.ResponsesOutputMessageStatusInProgress`
+
+```python
+value: models.ResponsesOutputMessageStatusInProgress = /* values here */
+```
+