feat(chat): implement sleep pressure and insomnia system

This commit introduces a new sleep pressure and insomnia system to simulate more realistic character behavior.

Key features include:
- **Sleep Pressure**: A new metric that accumulates with each action the bot takes and decreases during scheduled sleep times.
- **Insomnia Mechanic**: When a sleep period begins, the system checks the current sleep pressure. Low pressure can lead to a higher chance of "insomnia," causing the bot to stay awake. There is also a small chance for random insomnia.
- **Insomnia State**: During insomnia, the bot enters a special state for a configurable duration. It can trigger unique proactive thoughts related to being unable to sleep, and its mood is adjusted accordingly.
- **Configuration**: All parameters, such as insomnia probability, duration, and pressure thresholds, are fully configurable.

src/chat/chat_loop/wakeup_manager.py

@@ -39,6 +39,13 @@ class WakeUpManager:
         self.angry_duration = wakeup_config.angry_duration
         self.enabled = wakeup_config.enable
         self.angry_prompt = wakeup_config.angry_prompt
+        
+        # 失眠系统参数
+        self.insomnia_enabled = wakeup_config.enable_insomnia_system
+        self.sleep_pressure_threshold = wakeup_config.sleep_pressure_threshold
+        self.deep_sleep_threshold = wakeup_config.deep_sleep_threshold
+        self.insomnia_chance_low_pressure = wakeup_config.insomnia_chance_low_pressure
+        self.insomnia_chance_normal_pressure = wakeup_config.insomnia_chance_normal_pressure
 
     async def start(self):
         """启动唤醒度管理器"""
@@ -177,4 +184,36 @@ class WakeUpManager:
             "wakeup_threshold": self.wakeup_threshold,
             "is_angry": self.is_angry,
             "angry_remaining_time": max(0, self.angry_duration - (time.time() - self.angry_start_time)) if self.is_angry else 0
-        }
+        }
+
+    def check_for_insomnia(self) -> bool:
+        """
+        在尝试入睡时检查是否会失眠
+        
+        Returns:
+            bool: 如果失眠则返回 True，否则返回 False
+        """
+        if not self.insomnia_enabled:
+            return False
+
+        import random
+        
+        pressure = self.context.sleep_pressure
+        
+        # 压力过高，深度睡眠，极难失眠
+        if pressure > self.deep_sleep_threshold:
+            return False
+            
+        # 根据睡眠压力决定失眠概率
+        if pressure < self.sleep_pressure_threshold:
+            # 压力不足型失眠
+            if random.random() < self.insomnia_chance_low_pressure:
+                logger.info(f"{self.context.log_prefix} 睡眠压力不足 ({pressure:.1f})，触发失眠！")
+                return True
+        else:
+            # 压力正常，随机失眠
+            if random.random() < self.insomnia_chance_normal_pressure:
+                logger.info(f"{self.context.log_prefix} 睡眠压力正常 ({pressure:.1f})，触发随机失眠！")
+                return True
+        
+        return False