完善初始化更新

sproutgate-backend/internal/handlers/public_registration.go

@@ -0,0 +1,14 @@
+package handlers
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+// GetPublicRegistrationPolicy 公开：是否必须邀请码（不含具体邀请码）。
+func (h *Handler) GetPublicRegistrationPolicy(c *gin.Context) {
+	c.JSON(http.StatusOK, gin.H{
+		"requireInviteCode": h.store.RegistrationRequireInvite(),
+	})
+}