fix: Update type hints to use newer Python syntax

- Replace Dict, List, Optional with dict, list,  < /dev/null |  None syntax
- Fix abstract method implementation in message.py
- Improve type annotations and function return types
- Remove unreachable code in get_current_task_tool.py
- Refactor HTML elements to use style attributes

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

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

src/config/config.py

@@ -271,8 +271,8 @@ class BotConfig:
     enable_pfc_chatting: bool = False  # 是否启用PFC聊天
 
     # 模型配置
-    llm_reasoning: Dict[str, str] = field(default_factory=lambda: {})
-    # llm_reasoning_minor: Dict[str, str] = field(default_factory=lambda: {})
+    llm_reasoning: dict[str, str] = field(default_factory=lambda: {})
+    # llm_reasoning_minor: dict[str, str] = field(default_factory=lambda: {})
     llm_normal: Dict[str, str] = field(default_factory=lambda: {})
     llm_topic_judge: Dict[str, str] = field(default_factory=lambda: {})
     llm_summary: Dict[str, str] = field(default_factory=lambda: {})