YN-0620 - Batch creator/publisher/loader + Improve batch_utils module

[rdelillo]

Changelog Description

fixes 119 #118
Changes:

• Add Flame batch serializer/deserializer as consolidated json file
• Add Batch creator + publisher (workfile product type)
• Add Batch loader leveraging the Flame batch iteration

Tests

Tested on Flame 2026 macOs

Testing notes:

1. In Flame. go in batch tab
2. Creator -> Batch -> Publish
3. Do some changes, publish again
4. Ensure you can load the resulting batch from the loader with all of its iterations

[Copilot]

Pull request overview

This PR expands Flame Batch workflow support by introducing batch-specific menus and adding publish/load tooling to serialize a Flame batch group into a consolidated JSON “workfile” representation and reload versions as native Flame batch iterations.

Changes:

• Add a dedicated Batch menu context (FlameMenuBatch) and wire it into Flame startup hooks.
• Introduce batch workfile creator/extractor/loader plugins (publish consolidated JSON; load all versions as batch iterations).
• Refactor/extend batch_utils with batch create/update, reel management, batch content editing, and consolidated JSON save/load.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
client/ayon_flame/startup/AYON_in_flame.py	Registers the new Batch menu app and routes Batch hook menus to it.
client/ayon_flame/api/menu.py	Adds FlameMenuBatch with Create/Publish/Load/Library actions in Batch context.
client/ayon_flame/api/init.py	Exposes new menu + batch utils API surface; removes deprecated batch lookup export.
client/ayon_flame/api/lib.py	Removes get_batch_group_from_desktop helper.
client/ayon_flame/api/batch_utils.py	Adds batch CRUD helpers and consolidated JSON (de)serialization utilities.
client/ayon_flame/plugins/create/create_batch.py	Adds a Batch “workfile” creator storing instance metadata in a Note node.
client/ayon_flame/plugins/publish/extract_batch_workfile.py	Adds extractor to export current batch group into consolidated JSON representation.
client/ayon_flame/plugins/load/load_batch.py	Adds loader that loads all published versions as Flame batch iterations.
client/ayon_flame/plugins/publish/integrate_batch_group.py	Updates integration flow to use the new batch utils APIs.

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[iLLiCiTiT]

I'd get rid of library, it is the same thing as loader.

Suggested change

	menu['actions'].append({
	"name": "4 - Library...",
	"execute": lambda x: self.tools_helper.show_library_loader()
	})

[iLLiCiTiT]

Suggested change

	product_type=self.product_type,
	product_type=self.product_base_type,

[iLLiCiTiT]

Suggested change

	product_type=self.product_type,
	product_type=self.product_base_type,