refactor(cleanup): 移除未使用的导入项与冗余代码

清理了整个代码库中所有无用的模块导入、重复定义以及冗余变量引用，具体包括：
- bot.py 去掉了 random、typing 的未使用 import
- antipromptinjector 模块统一移除未引用的 DetectionResult、Dict、List 等
- chat_loop 中删除了未调用的 Timer、mai_thinking_manager、events_manager 等引用
- qzone_service 删除多余 f-string 大括号，避免日志警告格式问题
- 其他模块同步剔除各自范围内的冗余 import（asyncio、datetime 等共 20+ 处）

保持功能不变，仅作代码整洁度优化，无破坏性变更。(并添加了一个现在暂时还没加进去的必应搜索源文件)

src/chat/chat_loop/cycle_processor.py

@@ -5,12 +5,9 @@ from typing import Optional, Dict, Any
 
 from src.common.logger import get_logger
 from src.config.config import global_config
-from src.chat.utils.timer_calculator import Timer
 from src.chat.planner_actions.planner import ActionPlanner
 from src.chat.planner_actions.action_modifier import ActionModifier
-from src.plugin_system.core import events_manager
-from src.plugin_system.base.component_types import EventType, ChatMode
-from src.mais4u.mai_think import mai_thinking_manager
+from src.plugin_system.base.component_types import ChatMode
 from src.mais4u.constant_s4u import ENABLE_S4U
 from src.chat.chat_loop.hfc_utils import send_typing, stop_typing
 from .hfc_context import HfcContext

src/chat/chat_loop/heartFC_chat.py

@@ -5,7 +5,6 @@ from typing import Optional
 
 from src.common.logger import get_logger
 from src.config.config import global_config
-from src.chat.message_receive.chat_stream import get_chat_manager
 from src.person_info.relationship_builder_manager import relationship_builder_manager
 from src.chat.express.expression_learner import expression_learner_manager
 from src.plugin_system.base.component_types import ChatMode

src/chat/chat_loop/hfc_context.py

@@ -1,4 +1,4 @@
-from typing import List, Optional, Dict, Any, TYPE_CHECKING
+from typing import List, Optional, TYPE_CHECKING
 import time
 from src.chat.message_receive.chat_stream import ChatStream, get_chat_manager
 from src.person_info.relationship_builder_manager import RelationshipBuilder

src/chat/chat_loop/proactive_thinker.py

@@ -1,7 +1,7 @@
 import asyncio
 import time
 import traceback
-from typing import Optional, Dict, Any, TYPE_CHECKING
+from typing import Optional, TYPE_CHECKING
 
 from src.common.logger import get_logger
 from src.config.config import global_config

src/chat/chat_loop/response_handler.py

@@ -1,7 +1,7 @@
 import time
 import random
 import traceback
-from typing import Optional, Dict, Any, List, Tuple
+from typing import Optional, Dict, Any, Tuple
 
 from src.common.logger import get_logger
 from src.config.config import global_config