dsh-vision-pro-bridge: Completing the Vision Capabilities of DeepSeek-V4-Pro

The `dsh-vision-pro-bridge` plugin adds vision capabilities to the `deepseek-v4-pro` model in DeepSeek Harness (DSH). Through a routing proxy, it leverages the official DeepSeek API to first use `deepseek-v4-flash-vision-exp` to transcribe images into text, then passes the text and paths to the Pro model for processing. The plugin features zero third-party dependencies and content-addressed persistence. After installation, users can select the “DeepSeek-V4-Pro (Vision Bridge)” model to perform screenshot analysis while retaining the Pro model’s coding capabilities, making it suitable for use cases such as layout analysis and OCR.