Add Battlegrounds collection unlock (browse and pick any skin in-game)

[GodzzilaS]

概述 Overview

实现/解决/优化的内容（implemented/solved/optimized/fixed:）:

New toggle isBgsUnlockCollectionEnable. When enabled, the whole Battlegrounds collection shows as owned inside the game, so you can open the in-game Battlegrounds collection and browse and pick any cosmetic: hero skins, bartenders, boards, finishers, emotes and pets. It is visual and local only, it does not grant real ownership and does not change what opponents see. It pairs with the existing skin overrides (skinHero, skinBob, skinBgsBoard, skinBgsFinisher, skinPet) to apply a picked skin.

Implementation: a PatchBgsUnlockCollection Harmony patch that forces CollectionManager.OwnsBattlegrounds* and the BG cosmetic DataModel Owned/IsOwned getters to return true. It uses TargetMethods and skips any method it cannot resolve, so it will not crash on future game updates. Adds enUS, zhCN and ruRU strings.

检查 Check

功能 Function

• 若有新增，已编写完善的配置文件字段说明，并确保enUS.json已完善 (config field descriptions added; enUS.json completed, also zhCN.json and ruRU.json)
• 若有必要，已编写面向用户的新功能说明 (user-facing description added in the config strings)
• 已测试新功能或更改 tested in-game: the Battlegrounds cosmetics show as unlocked and skins can be picked and applied in-game. Note: the web config editor (localhost:58744) path for this new toggle was not tested, the toggle was enabled through the .cfg file.

风险 Risk

可能导致或已知的问题 (known limitations):

Visual and local only. Clicking "favorite" on an unowned cosmetic does not persist because the server rejects it, so the skin is applied through the existing skin id overrides, not the favorite button. Everything is gated behind the toggle (default off), so it has no effect unless enabled. The web config UI for this toggle was not verified.

[Pik-4]

thanks.