修复下载光影时对话框的标题文字错误

[Wulian233]

在下载世界、模组、资源包时，都会使用对应的类别，但是 SHADER_PACK 忘记 case 了，导致默认是模组下载

效果图片

[Calboot]

How about #4980 ?
这个问题实际上是 #4680 的一部分

[Copilot]

Pull request overview

This PR fixes a bug where downloading shader packs displayed an incorrect dialog title showing "mod download" instead of "shader download". The fix adds proper handling for the SHADER_PACK type across the codebase.

• Added SHADER_PACK enum value to RemoteModRepository.Type
• Updated the download dialog title logic to include a case for shader packs
• Added localization strings for shader pack download titles in all language files (English, Simplified Chinese, Traditional Chinese, and Classical Chinese)

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
HMCLCore/src/main/java/org/jackhuang/hmcl/mod/RemoteModRepository.java	Added SHADER_PACK enum value to the Type enum
HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/DownloadPage.java	Updated switch statement to include SHADER_PACK case for setting the correct dialog title
HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/HMCLLocalizedDownloadListPage.java	Added ofShaderPack factory method to create shader pack download pages
HMCL/src/main/java/org/jackhuang/hmcl/ui/download/DownloadPage.java	Updated shader tab to use the new ofShaderPack factory method instead of the generic DownloadListPage
HMCL/src/main/resources/assets/lang/I18N.properties	Added English translation for shader pack download title
HMCL/src/main/resources/assets/lang/I18N_zh_CN.properties	Added Simplified Chinese translation for shader pack download title
HMCL/src/main/resources/assets/lang/I18N_zh.properties	Added Traditional Chinese translation for shader pack download title
HMCL/src/main/resources/assets/lang/I18N_lzh.properties	Added Classical Chinese translation for shader pack download title

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