fix: Z-Library 按需获取下载地址并发布 v2.1.4

src/sources/index.js

@@ -36,7 +36,12 @@ const sources = [
 const byId = new Map(sources.map((s) => [s.id, s]));
 
 function listSources() {
-  return sources.map((s) => ({ id: s.id, name: s.name, supportsSearch: s.supportsSearch !== false }));
+  return sources.map((s) => ({
+    id: s.id,
+    name: s.name,
+    supportsSearch: s.supportsSearch !== false,
+    downloadOnDemand: s.downloadOnDemand === true
+  }));
 }
 
 function getSource(id) {

src/sources/zlib.js

@@ -270,6 +270,7 @@ module.exports = {
   id: 'zlib',
   name: 'Z-Library',
   supportsSearch: true,
+  downloadOnDemand: true,
 
   // 无关键词时展示热门书目
   async list(page) {