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* Implement distributed inference API server with FastAPI

- Added a new file `api_server_dist.py` to handle video generation tasks using distributed inference.
- Introduced endpoints for task submission, status checking, and result retrieval.
- Implemented image downloading and task management with error handling.
- Enhanced `infer.py` to ensure proper initialization of distributed processes.
- Created a shell script `start_api_with_dist_inference.sh` for easy server startup with environment setup.

This commit establishes a robust framework for managing video generation tasks in a distributed manner.

* Enhance file download endpoint with path traversal protection and error handling

* style: format

* refactor: Enhance video generation functionality with task interruption support

* feat: Add image upload and video generation endpoint with unique task handling

- Introduced a new endpoint `/v1/local/video/generate_form` for video generation that accepts image uploads.
- Implemented unique filename generation for uploaded images to prevent conflicts.
- Enhanced directory management for input and output paths.
- Improved file download response with detailed status and size information.
- Added error handling for distributed inference processes and graceful shutdown procedures.