fix(chu): 添加 Umiguri 新版本头部标签到静默忽略列表

[Applesaber]

添加以下 Umiguri 新版本使用的头部标签到 UgcParser 的静默忽略列表：

• @MAINBPM\ — 主 BPM 显示值
• @usetil\ — TIL 切换指令
• @ENDHEAD\ — 头部结束标记
• @BGSCENE\ — 背景场景
• @FLDSCENE\ — 地面场景
• @RLDATE\ — 发布日期
• @cmt\ — 注释

这些标签是 Umiguri 的元数据/渲染相关标签，对转谱逻辑不影响，之前会触发「未知头部标签」的 Info 级别警告。

Summary by Sourcery

错误修复：

• 防止 Umiguri 元数据和与渲染相关的头部标签在 UgcParser 中产生多余的信息级 “unknown header” 警告。

Original summary in English

Summary by Sourcery

Bug Fixes:

• Prevent new Umiguri metadata and rendering-related header tags from generating spurious info-level "unknown header" warnings in UgcParser.

[sourcery-ai]

审阅者指南（在小型 PR 上折叠）

审阅者指南

向 UgcParser 的“静默忽略”头标签列表中添加了若干新的 Umiguri 专用头标签，这样它们将不再产生“未知头标签”的 info 级别提示，因为它们仅用于元数据/渲染，不影响谱面转换逻辑。

文件级变更

变更	详情	文件
扩展 Chu UGC 头部解析器的静默忽略列表，加入新的 Umiguri 元数据/渲染标签，使其被解析为 no-op，而不是生成 info 级别警告。	在负责将已知外观（cosmetic）头标签视为忽略项的 switch case 分支中添加 @MAINBPM、@usetil 和 @ENDHEAD 在同一个忽略标签的 case 代码块中添加 @BGSCENE、@FLDSCENE、@RLDATE 和 @cmt，以避免这些新 Umiguri 版本出现未知头标签警告	parser/chu/UgcParser.cs

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Original review guide in English

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds several new Umiguri-specific header tags to the UgcParser’s silently-ignored header list so they no longer emit "unknown header tag" info-level alerts, as they are metadata/rendering-only and do not affect chart conversion logic.

File-Level Changes

Change	Details	Files
Extend the Chu UGC header parser’s silent-ignore list with new Umiguri metadata/rendering tags so they are parsed as no-ops instead of generating info-level warnings.	Add @MAINBPM, @usetil, and @ENDHEAD to the switch case branch that treats known cosmetic header tags as ignored Add @BGSCENE, @FLDSCENE, @RLDATE, and @cmt to the same ignored-tag case block to prevent unknown-header alerts for these new Umiguri versions	parser/chu/UgcParser.cs

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[gemini-code-assist]

Code Review

This pull request adds several UGC header tags to the silent ignore list in UgcParser.cs. However, adding @ENDHEAD to this list introduces a potential bug where the parser fails to transition out of the header state if the tag contains trailing whitespace, leading to empty note lists. It is recommended to handle @ENDHEAD using robust tag extraction logic in the main parse loop instead.

[sourcery-ai]

嗨——我已经审阅了你的修改，一切看起来都很棒！

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Original comment in English

Hey - I've reviewed your changes and they look great!

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[cubic-dev-ai]

No issues found across 1 file

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