新增示例库逻辑

docs/en/user-guide/api.md

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+# API Usage
+
+Pixelle-Video provides a complete Python API for easy integration into your projects.
+
+---
+
+## Quick Start
+
+```python
+from pixelle_video.service import PixelleVideoCore
+import asyncio
+
+async def main():
+    # Initialize
+    pixelle = PixelleVideoCore()
+    await pixelle.initialize()
+    
+    # Generate video
+    result = await pixelle.generate_video(
+        text="Why develop a reading habit",
+        mode="generate",
+        n_scenes=5
+    )
+    
+    print(f"Video generated: {result.video_path}")
+
+# Run
+asyncio.run(main())
+```
+
+---
+
+## API Reference
+
+For detailed API documentation, see [API Overview](../reference/api-overview.md).
+
+---
+
+## Examples
+
+For more usage examples, check the `examples/` directory in the project.
+