Support "List/Edit Custom Fields" endpoints#181

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AnssiAhola wants to merge 3 commits intomasterfrom

167-support-the-listedit-custom-fields-endpoints

Commits on Jan 17, 2026

Add support for fetching user-defined custom fields and fields assigned to collection items
AnssiAhola
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Add method to update user-defined custom fields for a collection item
AnssiAhola
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Add method to find user-defined custom field notes in CollectionItemInstance
AnssiAhola
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