fix(render+admin): render queue shows ALL users' jobs

The admin render queue called the user-scoped /v1/renders (so it only showed the
admin's own jobs) and parsed items/total instead of data/meta (→ always empty).
- render-svc: GET /v1/admin-renders (admin) → ListAllJobs across users, optional
  ?status= filter; gateway-wired
- admin renders page now fetches /v1/admin-renders and reads data/meta correctly

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/render/internal/handlers/renders_admin.go

@@ -0,0 +1,34 @@
+package handlers
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/flatrender/render-svc/internal/models"
+	"github.com/gin-gonic/gin"
+)
+
+// GET /v1/admin-renders — all users' render jobs (admin), optional ?status= filter.
+func (h *RenderHandler) AdminList(c *gin.Context) {
+	status := c.Query("status")
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	if page < 1 {
+		page = 1
+	}
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "30"))
+	if pageSize < 1 || pageSize > 100 {
+		pageSize = 30
+	}
+	jobs, total, err := h.store.ListAllJobs(c.Request.Context(), status, page, pageSize)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, models.APIError{Code: "internal_error", Message: err.Error()})
+		return
+	}
+	if jobs == nil {
+		jobs = []*models.RenderJob{}
+	}
+	c.JSON(http.StatusOK, models.PagedResponse[*models.RenderJob]{
+		Data: jobs,
+		Meta: models.PaginationMeta{Page: page, PageSize: pageSize, Total: total, HasMore: int64(page*pageSize) < total},
+	})
+}