新增示例库逻辑

docs/en/user-guide/templates.md

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+# Template Development
+
+How to create custom video templates.
+
+---
+
+## Template Introduction
+
+Video templates use HTML to define the layout and style of video frames.
+
+---
+
+## Template Structure
+
+Templates are located in the `templates/` directory, grouped by size:
+
+```
+templates/
+├── 1080x1920/  # Portrait
+├── 1920x1080/  # Landscape
+└── 1080x1080/  # Square
+```
+
+---
+
+## Creating Templates
+
+1. Copy an existing template file
+2. Modify HTML and CSS
+3. Save to the corresponding size directory
+4. Select and use in Web interface
+
+---
+
+## Template Variables
+
+Templates support the following variables:
+
+- `{{ title }}` - Video title
+- `{{ text }}` - Scene text
+- `{{ image }}` - Scene image
+
+---
+
+## More Information
+
+Detailed template development guide coming soon.
+