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/chatgenerationparamsresponseformatunion.md

@@ -0,0 +1,35 @@
+# ChatGenerationParamsResponseFormatUnion
+
+
+## Supported Types
+
+### `models.ChatGenerationParamsResponseFormatText`
+
+```python
+value: models.ChatGenerationParamsResponseFormatText = /* values here */
+```
+
+### `models.ChatGenerationParamsResponseFormatJSONObject`
+
+```python
+value: models.ChatGenerationParamsResponseFormatJSONObject = /* values here */
+```
+
+### `models.ResponseFormatJSONSchema`
+
+```python
+value: models.ResponseFormatJSONSchema = /* values here */
+```
+
+### `models.ResponseFormatTextGrammar`
+
+```python
+value: models.ResponseFormatTextGrammar = /* values here */
+```
+
+### `models.ChatGenerationParamsResponseFormatPython`
+
+```python
+value: models.ChatGenerationParamsResponseFormatPython = /* values here */
+```
+