all: remove koka code, move go to repo root

uma.go

@@ -0,0 +1,44 @@
+package horse
+
+type UmaID int32
+
+type Uma struct {
+	ID          UmaID       `json:"chara_card_id"`
+	CharacterID CharacterID `json:"chara_id"`
+	Name        string      `json:"name"`
+	Variant     string      `json:"variant"`
+
+	Sprint AptitudeLevel `json:"sprint"`
+	Mile   AptitudeLevel `json:"mile"`
+	Medium AptitudeLevel `json:"medium"`
+	Long   AptitudeLevel `json:"long"`
+	Front  AptitudeLevel `json:"front"`
+	Pace   AptitudeLevel `json:"pace"`
+	Late   AptitudeLevel `json:"late"`
+	End    AptitudeLevel `json:"end"`
+	Turf   AptitudeLevel `json:"turf"`
+	Dirt   AptitudeLevel `json:"dirt"`
+
+	Unique   SkillID `json:"unique"`
+	Skill1   SkillID `json:"skill1"`
+	Skill2   SkillID `json:"skill2"`
+	Skill3   SkillID `json:"skill3"`
+	SkillPL2 SkillID `json:"skill_pl2"`
+	SkillPL3 SkillID `json:"skill_pl3"`
+	SkillPL4 SkillID `json:"skill_pl4"`
+	SkillPL5 SkillID `json:"skill_pl5"`
+}
+
+type AptitudeLevel int8
+
+//go:generate go run golang.org/x/tools/cmd/stringer@v0.41.0 -type AptitudeLevel -trimprefix AptitudeLv
+const (
+	AptitudeLvG AptitudeLevel = iota + 1
+	AptitudeLvF
+	AptitudeLvE
+	AptitudeLvD
+	AptitudeLvC
+	AptitudeLvB
+	AptitudeLvA
+	AptitudeLvS
+)