优化代码格式和异常处理

- 修复异常处理链，使用from语法保留原始异常
- 格式化代码以符合项目规范
- 优化导入模块的顺序

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/plugins/schedule/schedule_generator.py

@@ -23,7 +23,7 @@ class ScheduleGenerator:
     def __init__(self):
         # 根据global_config.llm_normal这一字典配置指定模型
         # self.llm_scheduler = LLMModel(model = global_config.llm_normal,temperature=0.9)
-        self.llm_scheduler = LLM_request(model=global_config.llm_normal, temperature=0.9,request_type = 'scheduler')
+        self.llm_scheduler = LLM_request(model=global_config.llm_normal, temperature=0.9, request_type="scheduler")
         self.today_schedule_text = ""
         self.today_schedule = {}
         self.tomorrow_schedule_text = ""