Add show_version_updates CLI feature flag

[Kosinkadink]

Registers a show_version_updates bool feature flag (default true) 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).

When the flag is not passed, it is absent from the server features and the frontend falls back to its own default, so behavior is unchanged for non-launcher runs.

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

• Comfy-Org/ComfyUI (this PR) — register the flag
• Comfy-Org/ComfyUI_frontend — read the flag as the setting default
• Comfy-Org/Comfy-Desktop — inject the flag from a settings toggle

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 7cb784e and 9c0f668.

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• comfy_api/feature_flags.py

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📝 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 True 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 names the new CLI feature flag added by this PR.
Description check	✅ Passed	The description accurately explains the new flag and its role in launcher/frontend behavior.
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.

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