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/responsesoutputitem.md

@@ -0,0 +1,43 @@
+# ResponsesOutputItem
+
+An output item from the response
+
+
+## Supported Types
+
+### `models.ResponsesOutputMessage`
+
+```python
+value: models.ResponsesOutputMessage = /* values here */
+```
+
+### `models.ResponsesOutputItemReasoning`
+
+```python
+value: models.ResponsesOutputItemReasoning = /* values here */
+```
+
+### `models.ResponsesOutputItemFunctionCall`
+
+```python
+value: models.ResponsesOutputItemFunctionCall = /* values here */
+```
+
+### `models.ResponsesWebSearchCallOutput`
+
+```python
+value: models.ResponsesWebSearchCallOutput = /* values here */
+```
+
+### `models.ResponsesOutputItemFileSearchCall`
+
+```python
+value: models.ResponsesOutputItemFileSearchCall = /* values here */
+```
+
+### `models.ResponsesImageGenerationCall`
+
+```python
+value: models.ResponsesImageGenerationCall = /* values here */
+```
+