refactor(plugins): 重构亲和力流模块的导入路径

将 chatter 模块重命名为 affinity_flow_chatter 以明确功能区分，
更新 main.py、base_chatter.py、affinity_chatter.py 和 planner.py
中的相关导入语句，确保模块引用正确性。

src/plugin_system/base/base_chatter.py

@@ -6,7 +6,7 @@ from src.plugin_system.base.component_types import ChatterInfo, ComponentType
 
 if TYPE_CHECKING:
     from src.chat.planner_actions.action_manager import ChatterActionManager
-    from src.plugins.built_in.chatter.planner import ChatterActionPlanner as ActionPlanner
+    from src.plugins.built_in.affinity_flow_chatter.planner import ChatterActionPlanner as ActionPlanner
 
 class BaseChatter(ABC):
     chatter_name: str = ""