refactor(api): introduce v1 response contract

backend/internal/httpx/params.go

@@ -0,0 +1,18 @@
+package httpx
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+)
+
+// IdentityParam 只接受 UUIDv7 路径参数，避免把内部自增 ID 暴露为外部标识。
+func IdentityParam(c *gin.Context, name string) (string, bool) {
+	identity, err := uuid.Parse(c.Param(name))
+	if err != nil || identity.Version() != 7 {
+		Error(c, http.StatusBadRequest, "invalid_request", "请求参数无效")
+		return "", false
+	}
+	return identity.String(), true
+}