refactor(boba-tea-shop): remove deprecated a2a dependency and update doc#404

AlbumenJ merged 1 commit intoagentscope-ai:mainagentscope-ai/agentscope-java:mainfrom

LearningGp:boba-tea-shop-depLearningGp/agentscope-java:boba-tea-shop-depCopy head branch name to clipboard