refactor: remove additional dead exports and unused actions

Remove buildFontUrl, measureText, uncached, invalidateCache, fetchJsonWithFlareSolver, upsertPermission, deletePermission, bulkImportPermissions, clearAllPermissions, bulkDeletePermissions, bulkDeletePhotos, userReplyTicket, closeTicketByUser. Update staff-smoke-contract test for bulkDeletePhotos removal.

src/lib/cache.ts

@@ -47,15 +47,3 @@ export async function cached<T>(
 
 	return data;
 }
-
-/** Invalidate a single cache key across Redis + memory (call after writes). */
-export async function uncached(key: string): Promise<void> {
-	memory.delete(key);
-	if (redis && redis.status !== "end") {
-		try {
-			await redis.del(key);
-		} catch {
-			/* non-critical */
-		}
-	}
-}