chore: unify version type and release channel in english locale

[3gf8jv4dv]

• Rename "development" to "beta" in docs
• Rename "release" to "stable" in language files

[Glavo]

Rename "development" to "beta" in docs

HMCL 有使用过 beta 版本这种称呼吗？

[3gf8jv4dv]

HMCL 有使用过 beta 版本这种称呼吗？

HMCL/HMCL/src/main/resources/assets/lang/I18N.properties

Lines 1574 to 1586 in 272c5d1

	update.channel.dev=Beta
	update.channel.dev.hint=You are currently using a Beta channel build of the launcher. While it may include some extra features, it is also sometimes less stable than the Release channel builds.\n\
	\n\
	If you encounter any bugs or problems, please submit feedback via the channels provided on the <a href="hmcl://settings/feedback">Feedback</a> page.\n\
	\n\
	Follow <a href="https://space.bilibili.com/1445341">@huanghongxun</a> on Bilibili to stay up to date on important HMCL news, or <a href="https://space.bilibili.com/20314891">@Glavo</a> to learn about HMCL development progress.
	update.channel.dev.title=Beta Channel Notice
	update.channel.nightly=Nightly
	update.channel.nightly.hint=You are currently using a Nightly channel build of the launcher. While it may include some extra features, it is also always less stable than the other channel builds.\n\
	\n\
	If you encounter any bugs or problems, please submit feedback via the channels provided on the <a href="hmcl://settings/feedback">Feedback</a> page.\n\
	\n\
	Follow <a href="https://space.bilibili.com/1445341">@huanghongxun</a> on Bilibili to stay up to date on important HMCL news, or <a href="https://space.bilibili.com/20314891">@Glavo</a> to learn about HMCL development progress.

#3367 (comment)

[Copilot]

Pull request overview

Updates terminology across user-facing English strings and release documentation to refer to the “Stable” channel/version and “Beta” (instead of “Release” / “Development”), aligning the wording used in update UI notices with the release schedule doc.

Changes:

• Update English updater channel strings: “Release” → “Stable” and adjust Beta hint wording accordingly.
• Update docs/ReleaseSchedule.md to rename “Development” version/channel/phase to “Beta”.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
HMCL/src/main/resources/assets/lang/I18N.properties	Renames the stable update channel label to “Stable” and updates the Beta channel hint to reference “Stable” builds.
docs/ReleaseSchedule.md	Renames “Development” terminology to “Beta” throughout the English release schedule documentation.

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[3gf8jv4dv]

ping @Glavo