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

[Wulian233]

[Glavo]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a version normalization mechanism for Legacy Fabric versions, specifically converting the '2point0_' prefix to '2.0_' for internal storage while retaining the original metadata version for API calls. A review comment suggests enhancing the robustness of the normalizeVersion method to handle cases where the version string might be exactly '2point0' without a trailing underscore.

[gemini-code-assist]

这个 normalizeVersion 方法目前仅处理了带有下划线的前缀 2point0_。虽然目前 Legacy Fabric 的 Meta API 可能主要返回这种格式，但为了提高代码的健壮性，建议也处理一下不带下划线的情况（例如直接是 2point0），以防未来 API 返回格式发生变化。

Suggested change

	private static String normalizeVersion(String version) {
	return version.startsWith("2point0_")
	? "2.0_" + version.substring("2point0_".length())
	: version;
	}
	private static String normalizeVersion(String version) {
	if (version.startsWith("2point0_")) {
	return "2.0_" + version.substring("2point0_".length());
	}
	return "2point0".equals(version) ? "2.0" : version;
	}