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/openairesponsesinputroleunion1.md

@@ -0,0 +1,29 @@
+# OpenAIResponsesInputRoleUnion1
+
+
+## Supported Types
+
+### `models.OpenAIResponsesInputRoleUser1`
+
+```python
+value: models.OpenAIResponsesInputRoleUser1 = /* values here */
+```
+
+### `models.OpenAIResponsesInputRoleSystem1`
+
+```python
+value: models.OpenAIResponsesInputRoleSystem1 = /* values here */
+```
+
+### `models.OpenAIResponsesInputRoleAssistant`
+
+```python
+value: models.OpenAIResponsesInputRoleAssistant = /* values here */
+```
+
+### `models.OpenAIResponsesInputRoleDeveloper1`
+
+```python
+value: models.OpenAIResponsesInputRoleDeveloper1 = /* values here */
+```
+