feat: move collections away from worldserver config reload

[Nyeriah]

No description provided.

[Copilot]

Pull request overview

This pull request refactors the transmog collection loading mechanism to separate it from the general world server config reload, introducing a dedicated reload command for transmog-specific configuration and collections.

Key Changes:

• Extracted collection loading logic from OnAfterConfigLoad into a new LoadCollections() method that only runs on initial server startup
• Added a new .transmog reload command for administrators to reload transmog configuration and collections independently
• Collections are no longer reloaded automatically when world server config is reloaded

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/transmog_scripts.cpp	Modified OnAfterConfigLoad to only call LoadCollections() on initial startup, not during config reload
src/cs_transmog.cpp	Added new HandleReloadTransmogConfig command handler for manual transmog reload
src/Transmogrification.h	Added LoadCollections() method declaration
src/Transmogrification.cpp	Implemented LoadCollections() method with the collection loading logic extracted from the world script

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