feat(config): add expired box cleanup functionality

Adds dedicated config setting and cleanup logic for
managing expired content boxes via admin tools and CLI.

static/js/admin/boxes.js

@@ -373,6 +373,35 @@
         }
     }
 
+    async function runCleanupAction() {
+        try {
+            const response = await fetch("/admin/boxes/actions", {
+                method: "POST",
+                headers: { "Content-Type": "application/json" },
+                body: JSON.stringify({ action: "cleanup_expired", box_ids: [] })
+            });
+            const payload = await response.json();
+            if (!response.ok) {
+                const message = payload.error || payload.message || "Cleanup failed";
+                showToast(message, "error", 3200);
+                return;
+            }
+            state.boxes = Array.isArray(payload.boxes) ? payload.boxes : state.boxes;
+            state.selected.clear();
+            if (state.activeId && !state.boxes.some((box) => box.id === state.activeId)) {
+                state.activeId = null;
+            }
+            renderTable();
+            let message = payload.message || "Expired cleanup completed";
+            if (Array.isArray(payload.warnings) && payload.warnings.length) {
+                message += ` (${payload.warnings.length} warning${payload.warnings.length === 1 ? "" : "s"})`;
+            }
+            showToast(message, Array.isArray(payload.warnings) && payload.warnings.length ? "warning" : "success", 3200);
+        } catch (_) {
+            showToast("Network error while running cleanup", "error", 3200);
+        }
+    }
+
     function selectedIDsOrActive() {
         if (state.selected.size) return Array.from(state.selected);
         const active = currentActiveBox();
@@ -419,6 +448,10 @@
                 if (!window.confirm("Delete selected boxes? This removes stored files.")) return;
                 await runBulkAction("delete", selectedIDsOrActive());
                 return;
+            case "cleanup-expired":
+                if (!window.confirm("Run cleanup for expired boxes now?")) return;
+                await runCleanupAction();
+                return;
             case "help-scope":
                 showToast("Ownership filter waits for account + box owner data in backend", "info", 3400);
                 return;