refactor(chat): 重构HeartFChatting为模块化架构

将原本超长的heartFC_chat.py拆分为6个功能内聚的子模块：
- hfc_context：上下文数据容器
- cycle_tracker：循环状态记录
- energy_manager：能量值独立管理
- proactive_thinker：主动思考逻辑抽离
- cycle_processor：单次循环处理器
- response_handler / normal_mode_handler：响应策略

删除冗余常量、错误样板及旧逻辑；大幅减少类体积；降低耦合度，提升可维护性。

src/chat/chat_loop/hfc_context.py

@@ -0,0 +1,34 @@
+from typing import List, Optional, Dict, Any
+import time
+from src.chat.message_receive.chat_stream import ChatStream, get_chat_manager
+from src.person_info.relationship_builder_manager import RelationshipBuilder
+from src.chat.express.expression_learner import ExpressionLearner
+from src.plugin_system.base.component_types import ChatMode
+from src.chat.planner_actions.action_manager import ActionManager
+from src.chat.chat_loop.hfc_utils import CycleDetail
+
+class HfcContext:
+    def __init__(self, chat_id: str):
+        self.stream_id: str = chat_id
+        self.chat_stream: Optional[ChatStream] = get_chat_manager().get_stream(self.stream_id)
+        if not self.chat_stream:
+            raise ValueError(f"无法找到聊天流: {self.stream_id}")
+
+        self.log_prefix = f"[{get_chat_manager().get_stream_name(self.stream_id) or self.stream_id}]"
+        
+        self.relationship_builder: Optional[RelationshipBuilder] = None
+        self.expression_learner: Optional[ExpressionLearner] = None
+        
+        self.loop_mode = ChatMode.NORMAL
+        self.energy_value = 5.0
+        
+        self.last_message_time = time.time()
+        self.last_read_time = time.time() - 1
+        
+        self.action_manager = ActionManager()
+        
+        self.running: bool = False
+        
+        self.history_loop: List[CycleDetail] = []
+        self.cycle_counter = 0
+        self.current_cycle_detail: Optional[CycleDetail] = None