Fix 5963: 愚人节版本 Minecraft 2.0 的 Legacy Fabric 下载列表为空 (#6009)

HMCLCore/src/main/java/org/jackhuang/hmcl/download/legacyfabric/LegacyFabricVersionList.java

@@ -52,10 +52,13 @@ public final class LegacyFabricVersionList extends VersionList<LegacyFabricRemot
             lock.writeLock().lock();
 
             try {
-                for (String gameVersion : gameVersions)
-                    for (String loaderVersion : loaderVersions)
+                for (String metaGameVersion : gameVersions) {
+                    String gameVersion = normalizeVersion(metaGameVersion);
+                    for (String loaderVersion : loaderVersions) {
                         versions.put(gameVersion, new LegacyFabricRemoteVersion(gameVersion, loaderVersion,
-                                Collections.singletonList(getLaunchMetaUrl(gameVersion, loaderVersion))));
+                                Collections.singletonList(getLaunchMetaUrl(metaGameVersion, loaderVersion))));
+                    }
+                }
             } finally {
                 lock.writeLock().unlock();
             }
@@ -71,6 +74,12 @@ public final class LegacyFabricVersionList extends VersionList<LegacyFabricRemot
                 .stream().map(GameVersion::getVersion).collect(Collectors.toList());
     }
 
+    private static String normalizeVersion(String version) {
+        return version.startsWith("2point0_")
+                ? "2.0_" + version.substring("2point0_".length())
+                : version;
+    }
+
     private static String getLaunchMetaUrl(String gameVersion, String loaderVersion) {
         return String.format("https://meta.legacyfabric.net/v2/versions/loader/%s/%s", gameVersion, loaderVersion);
     }