feat: 更新SproutGate前后端代码

sproutgate-backend/internal/handlers/public_registration.go

@@ -4,11 +4,17 @@ import (
 	"net/http"
 
 	"github.com/gin-gonic/gin"
+
+	"sproutgate-backend/internal/storage"
 )
 
-// GetPublicRegistrationPolicy 公开：是否必须邀请码（不含具体邀请码）。
+// GetPublicRegistrationPolicy 公开：是否必须邀请码、自助注册账号规则说明（不含具体邀请码）。
 func (h *Handler) GetPublicRegistrationPolicy(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{
-		"requireInviteCode": h.store.RegistrationRequireInvite(),
+		"requireInviteCode":          h.store.RegistrationRequireInvite(),
+		"inviteRegisterRewardCoins": h.store.RegistrationInviteRegisterRewardCoins(),
+		"selfServiceAccountMin":     storage.MinSelfServiceAccountLen,
+		"selfServiceAccountMax":     storage.MaxSelfServiceAccountLen,
+		"selfServiceAccountHint":    "lowercase letters and digits only",
 	})
 }