Ship legacy migrate APIs, portfolio/blog old-id schema, and admin migrate/purge flows.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/storage/storage-keys.ts

@@ -0,0 +1,24 @@
+/**
+ * Parspack S3 object key layout (path-style public URLs):
+ *
+ *   meshkee/
+ *     businesses/
+ *       {businessId}/
+ *         media/{uuid}{ext}           — media library uploads
+ *         brand/favicon-{uuid}.png    — derived favicons
+ */
+const ROOT = 'meshkee';
+
+export function businessMediaKey(
+  businessId: bigint | string | number,
+  fileName: string,
+): string {
+  return `${ROOT}/businesses/${businessId}/media/${fileName}`;
+}
+
+export function businessBrandFaviconKey(
+  businessId: bigint | string | number,
+  fileName: string,
+): string {
+  return `${ROOT}/businesses/${businessId}/brand/${fileName}`;
+}