feat(fight): 实现精灵切换功能并优化战斗逻辑

- 新增 ChangePet 方法实现精灵切换
- 优化战斗循环逻辑，支持精灵切换
- 修复一些战斗相关的 bug
- 优化代码结构，提高可维护性

logic/main.go

@@ -8,6 +8,7 @@ import (
 	"github.com/gogf/gf/v2/os/gproc"
 
 	_ "blazing/contrib/drivers/pgsql"
+	"blazing/logic/service"
 
 	"blazing/cool"
 
@@ -17,6 +18,7 @@ import (
 )
 
 func signalHandlerForMain(sig os.Signal) {
+	service.Fightpool.Release()
 	fmt.Println("MainProcess is shutting down due to signal:", sig.String())
 }