Add direct unsellable override and SellingAnim support

[frg2089]

What kind of change is this?

• New feature, vanilla bugfix or enhancement of a released feature - changelog, docs and credits entries are needed.
• Improvement to a new (unreleased) feature - docs and credits entries are needed; no changelog entry (Skip Changelog).
• Bugfix to a new (unreleased) feature - credits entry is needed; no changelog or docs entries (Skip Changelog, Skip Docs).
• Bugfix to an old (released) feature - changelog and credits entries are needed; no docs entry (Skip Docs).
• Completely minor change (e.g. a typo fix) - no entries are needed (Skip Changelog, Skip Docs, Skip Credits).

Description

Directly sellable TechnoTypes

• Unsellable.Direct can be set to true to directly allow the TechnoType to be sold and ensure that the sell cursor is displayed in sell mode.

In rulesmd.ini:

[SOMETECHNO]             ; TechnoType
Unsellable.Direct=false  ; boolean

Custom animation when selling TechnoTypes

• SellingAnim can be used to play an additional custom animation when a TechnoType is sold.

In artmd.ini:

[SOMETECHNO]       ; TechnoType image section
SellingAnim=       ; AnimationType

Using this tag for BuildingTypes is not recommended. Buildings already play the game's built-in reversed `Buildup` animation when sold, so this feature is unnecessary for them.

[Copilot]

Pull request overview

This PR extends Phobos’s TechnoType selling behavior by adding (1) a per-type sell animation hookable via artmd.ini and (2) a rulesmd.ini flag to allow “direct” selling (including sell cursor support) for TechnoTypes beyond the default docked/unit-sell constraints. It also updates the user-facing documentation and zh_CN localization to describe the new tags.

Changes:

• Added SellingAnim (art tag) to optionally spawn a custom AnimType when a techno is sold.
• Added Unsellable.Direct (rules tag) to permit direct selling and force the sell cursor action in sell mode.
• Updated docs, credits, and zh_CN translations to reflect the new features.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/Misc/Hooks.BugFixes.cpp	Implements sell eligibility override, sell-cursor action override hook, and sell animation spawn on event execution.
src/Ext/TechnoType/Body.h	Adds new TechnoTypeExt fields for SellingAnim and Unsellable_Direct.
src/Ext/TechnoType/Body.cpp	Reads the new INI tags and serializes them for save/load persistence.
docs/Whats-New.md	Adds release notes entries referencing the new features and tags.
docs/New-or-Enhanced-Logics.md	Documents SellingAnim and Unsellable.Direct usage and placement.
docs/locale/zh_CN/LC_MESSAGES/Whats-New.po	Adds zh_CN translations for the new Whats-New entries.
docs/locale/zh_CN/LC_MESSAGES/New-or-Enhanced-Logics.po	Adds zh_CN translations for the new documentation sections.
docs/locale/zh_CN/LC_MESSAGES/CREDITS.po	Updates (partially) zh_CN credits translation strings impacted by the new feature credit entries.
CREDITS.md	Adds credits for the new features (with formatting changes to the contributor block).

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[TaranDahl]

Do not use AI description on the main page.
You can simply copy the doc.

[frg2089]

It make the infantry at here (yellow point)