feat(chat): 支持聊天记录实时更新（WCDB + SSE）

- 新增 WCDB realtime 连接管理与 DLL 依赖，并在 shutdown 释放资源

- 新增实时状态/变更 SSE 与增量同步接口（单会话/全会话）

- sessions/messages 支持 source=realtime，增强内容解码与 packed_info md5 提取

- wheel 打包包含 WCDB.dll / wcdb_api.dll

src/wechat_decrypt_tool/api.py

@@ -13,6 +13,7 @@ from .routers.health import router as _health_router
 from .routers.keys import router as _keys_router
 from .routers.media import router as _media_router
 from .routers.wechat_detection import router as _wechat_detection_router
+from .wcdb_realtime import WCDB_REALTIME, shutdown as _wcdb_shutdown
 
 # 初始化日志系统
 setup_logging()
@@ -46,6 +47,18 @@ app.include_router(_chat_export_router)
 app.include_router(_chat_media_router)
 
 
+@app.on_event("shutdown")
+async def _shutdown_wcdb_realtime() -> None:
+    try:
+        WCDB_REALTIME.close_all()
+    except Exception:
+        pass
+    try:
+        _wcdb_shutdown()
+    except Exception:
+        pass
+
+
 if __name__ == "__main__":
     import uvicorn