Add show_version_updates CLI feature flag

[Kosinkadink]

Registers a show_version_updates bool feature flag (default false) in CLI_FEATURE_FLAG_REGISTRY.

This lets a launcher discover the flag via --list-feature-flags and set it via --feature-flag show_version_updates=<bool>, which propagates into SERVER_FEATURE_FLAGS and is sent to the frontend. The frontend uses it to seed the default of its Comfy.Notification.ShowVersionUpdates setting (the user setting still overrides).

Default false: a plain ComfyUI run advertises the flag as off, so the frontend's in-app new-release / version-update notifications stay off by default on local installs. A launcher (or --feature-flag show_version_updates=true) can turn them on.

Part of a 3-repo change for Comfy-Org/Comfy-Desktop#1194:

• Comfy-Org/ComfyUI (this PR) — register the flag
• fix: gate version-update notifications on the ShowVersionUpdates setting (default off on local installs) ComfyUI_frontend#13171 — gate the notifications on the setting / read the flag as its default
• feat: add toggle to control ComfyUI version-update notifications (default off) Comfy-Desktop#1205 — inject the flag from a settings toggle

[coderabbitai]

📝 Walkthrough

Walkthrough

CLI_FEATURE_FLAG_REGISTRY in comfy_api/feature_flags.py now includes a new boolean flag named show_version_updates. The entry sets the default to False and adds description text indicating it controls frontend new-release/version-update notifications, while still allowing the user setting to override it.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding the show_version_updates CLI feature flag.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The description directly matches the change: adding the show_version_updates feature flag to the CLI registry.

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