Release 0.5.1

What's Changed

• feat: add web search tool-specific ak/sk by @Xiaoaier-Z-L in #391
• fix: donot use tuple when sequential_image_generation==auot by @warm-wm in #393
• feat: enable model fallbacks by @BhAem in #394
• feat: add uv install docs by @yaozheng-fang in #395
• chore(es): support cert connection for opensearch backend by @yaozheng-fang in #397
• docs: responses api by @zakahan in #396
• docs(prompt): add cozeloop api key fetching method by @yaozheng-fang in #398
• release 0.5.1 by @yaozheng-fang in #399

Full Changelog: 0.5.0...0.5.1