feat: list plugins with version, activation and update state

[ShunLuk]

No description provided.

[Copilot]

🟡 Changes recommended

The new plugins data function currently has runtime-breaking issues (missing return for an array-typed function and unsafe transient dereference) that can fatal the REST endpoint.

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Pull request overview

Adds a new REST API endpoint to expose an inventory of installed plugins, including version, activation state (site/network), and whether updates are available, complementing the existing relay/v1/core diagnostics endpoint.

Changes:

• Add relay_get_plugins() to collect plugin metadata plus activation and update availability details.
• Register a new relay/v1/plugins GET endpoint and implement relay_rest_plugins() to return that data.

File summaries

File	Description
includes/relay-data.php	Adds plugin inventory collection logic (name/version/active/network active/update info).
includes/relay-api.php	Registers the plugins REST route and implements the REST callback to return plugin data.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 4
• Review effort level: Lite

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[SimonvanWijhe]

Wil je de Features-lijst in readme.txt ook aanvullen met de pluginlijst?