refactor(logic): 移除伤害计算相关代码

- 删除了 Calculator.go、Context.go 和 MultiplierZone.go 文件
- 移除了 go.mod 中对 shopspring/decimal 的引用

logic/go.sum

@@ -41,6 +41,8 @@ github.com/panjf2000/gnet/v2 v2.9.1 h1:bKewICy/0xnQ9PMzNaswpe/Ah14w1TrRk91LHTcbI
 github.com/panjf2000/gnet/v2 v2.9.1/go.mod h1:WQTxDWYuQ/hz3eccH0FN32IVuvZ19HewEWx0l62fx7E=
 github.com/samber/lo v1.51.0 h1:kysRYLbHy/MB7kQZf5DSN50JHmMsNEdeY24VzJFu7wI=
 github.com/samber/lo v1.51.0/go.mod h1:4+MXEGsJzbKGaUEQFKBq2xtfuznW9oz/WrgyzMzRoM0=
+github.com/shopspring/decimal v1.4.0 h1:bxl37RwXBklmTi0C79JfXCEBD1cqqHt0bbgBAGFp81k=
+github.com/shopspring/decimal v1.4.0/go.mod h1:gawqmDU56v4yIKSwfBSFip1HdCCXN8/+DMd9qYNcwME=
 github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=