fix：增加流式模型构建异常处理，防止模型导致崩溃 - #38
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Closes #36
问题描述
当配置的阿里 Qwen 模型无效（如 API Key 错误、网络不通等）时，底层 LangChain4j 的
QwenHelper会在处理流式响应时抛出NoSuchElementException，导致对话中断并报错。修复方案
在
ModelStoreFactory.chatHandler中构建流式模型时，增加了try-catch异常捕获机制。当捕获到异常时，仅记录错误日志并跳过该模型的加载，防止单个模型配置错误导致整个流式对话服务崩溃。
修改文件
langchat-ai/langchat-ai-biz/src/main/java/cn/tycoding/langchat/ai/core/provider/factory/ModelStoreFactory.java