Feat: Add splash layer (#29)

Add splash layer, support game start, settings, exit
Modify settings layer, add "go back to splash" and "exit"
Add character threshold for history input
Closes #28

src/server/main.py

@@ -4,7 +4,10 @@ import asyncio
 import webbrowser
 import subprocess
 import time
+import threading
+import signal
 from contextlib import asynccontextmanager
+
 from typing import List, Optional
 from fastapi import FastAPI, WebSocket, WebSocketDisconnect, HTTPException, Query
 from fastapi.middleware.cors import CORSMiddleware
@@ -883,6 +886,18 @@ def get_map():
     }
 
 
+@app.post("/api/control/reset")
+def reset_game():
+    """重置游戏到 Idle 状态（回到主菜单）"""
+    game_instance["world"] = None
+    game_instance["sim"] = None
+    game_instance["is_paused"] = True
+    game_instance["init_status"] = "idle"
+    game_instance["init_phase"] = 0
+    game_instance["init_progress"] = 0
+    game_instance["init_error"] = None
+    return {"status": "ok", "message": "Game reset to idle"}
+
 @app.post("/api/control/pause")
 def pause_game():
     """暂停游戏循环"""
@@ -895,6 +910,17 @@ def resume_game():
     game_instance["is_paused"] = False
     return {"status": "ok", "message": "Game resumed"}
 
+@app.post("/api/control/shutdown")
+async def shutdown_server():
+    def _shutdown():
+        time.sleep(1) # 给前端一点时间接收 200 OK 响应
+        # 这种方式适用于 uvicorn 运行环境，或者直接杀进程
+        os.kill(os.getpid(), signal.SIGINT)
+    
+    # 异步执行关闭，确保先返回响应
+    threading.Thread(target=_shutdown).start()
+    return {"status": "shutting_down", "message": "Server is shutting down..."}
+
 
 # --- 初始化状态 API ---
 
@@ -1551,6 +1577,11 @@ async def api_load_game(req: LoadGameRequest):
         game_instance["init_start_time"] = time.time()
         game_instance["init_error"] = None
         game_instance["init_phase"] = 0
+        
+        # 0. 扫描资源 (修复读取存档不加载头像的问题)
+        game_instance["init_phase_name"] = "scanning_assets"
+        await asyncio.to_thread(scan_avatar_assets)
+
         game_instance["init_phase_name"] = "loading_save"
         game_instance["init_progress"] = 10