feat: AI Town MVP - 完整三层架构实现

- Python FastAPI 引擎：世界状态模拟、全局能量条、世界事件系统
- Node.js WebSocket 服务器：实时通信、事件队列批处理
- 前端仪表盘：世界状态可视化、行动日志、事件展示

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

engine-python/app/models.py

@@ -0,0 +1,82 @@
+from __future__ import annotations
+from pydantic import BaseModel, Field
+from typing import List, Dict, Optional
+from enum import Enum
+
+
+class Emotion(str, Enum):
+    CALM = "calm"
+    HAPPY = "happy"
+    ANXIOUS = "anxious"
+
+
+class Weather(str, Enum):
+    SUNNY = "sunny"
+    RAINY = "rainy"
+
+
+class GlobalMeter(BaseModel):
+    """全体能量条"""
+    value: int = 0
+    threshold: int = 100
+    cooldown: int = 0
+
+
+class WorldEffect(BaseModel):
+    """持续影响效果"""
+    type: str
+    name: str
+    intensity: int = 1
+    remaining_ticks: int = 5
+    mood_modifier: int = 0
+
+
+class AgentState(BaseModel):
+    emotion: Emotion = Emotion.CALM
+    goal: str = ""
+    memory: List[str] = Field(default_factory=list)
+
+
+class WorldState(BaseModel):
+    tick: int = 0
+    weather: Weather = Weather.SUNNY
+    town_mood: int = Field(default=0, ge=-10, le=10)
+    agents: Dict[str, AgentState] = Field(default_factory=dict)
+    events: List[str] = Field(default_factory=list)
+    global_meter: GlobalMeter = Field(default_factory=GlobalMeter)
+    world_effects: List[WorldEffect] = Field(default_factory=list)
+
+
+class Event(BaseModel):
+    type: str
+    text: str
+    user: str
+    ts: float
+
+
+class StepRequest(BaseModel):
+    events: List[Event] = Field(default_factory=list)
+
+
+class Action(BaseModel):
+    agent_id: str
+    say: str
+    do: str
+
+
+class GlobalEventInfo(BaseModel):
+    """世界级事件信息"""
+    name: str
+    description: str
+
+
+class GlobalEventResult(BaseModel):
+    """世界级事件触发结果"""
+    triggered: bool = False
+    event: Optional[GlobalEventInfo] = None
+
+
+class StepResponse(BaseModel):
+    world_state: WorldState
+    actions: List[Action]
+    global_event: GlobalEventResult = Field(default_factory=GlobalEventResult)