feat: set default battle starting energy to 50% for all avatars

internal/common/models.go

@@ -189,7 +189,7 @@ func (a *AvatarJson) SPCur() uint32 {
 	if a.SPValue != nil {
 		return *a.SPValue
 	}
-	return 10000
+	return a.SPMaxVal() / 2
 }
 
 func (a *AvatarJson) SPMaxVal() uint32 {