feat(i18n): integrate i18next for internationalization support and add initial translation setup

internal/model/hero_template.go

@@ -0,0 +1,15 @@
+package model
+
+// HeroTemplate represents template hero data from herodata.json.
+type HeroTemplate struct {
+	Code    string  `json:"code"`
+	Name    string  `json:"name"`
+	BaseAtk float64 `json:"baseAtk"`
+	BaseDef float64 `json:"baseDef"`
+	BaseHp  float64 `json:"baseHp"`
+	BaseSpd float64 `json:"baseSpd"`
+	BaseCr  float64 `json:"baseCr"`
+	BaseCd  float64 `json:"baseCd"`
+	BaseEff float64 `json:"baseEff"`
+	BaseRes float64 `json:"baseRes"`
+}