fix(kit): scope plugin hooks per app

[webfansplz]

When several Vue apps on one page register the same plugin id (Pinia does this once per app), the kit kept a single adapter per id and overwrote its descriptor.app with the latest app. App scoping then rejected hook payloads for every other app, so their custom inspectors came back empty. For example, only the last app to register Pinia showed its stores in the Pinia tab.

This is a v9 regression. In v8.2.1 each setupDevtoolsPlugin call got its own API bound to its own descriptor.

Fix

• registry.ts: a private RegisteredPlugin per plugin id keeps one adapter per app. A setup for a known app reuses that app's adapter; a new app gets its own; a setup without an app joins the first. Descriptor metadata is merged into all of them. Hook calls go to every adapter, and each one filters by its own app as before.
• settings.ts (internal, not exported): PluginSettings holds setting values per plugin id and is shared by all adapters of that id. A change reaches every app's setPluginSettings handlers with the correct oldValue.
• createPluginApiAdapter takes the settings store as a new optional argument. No existing exported type changes.

Note: plugins.adapters still maps a plugin id to its first adapter. That adapter backs the plugin snapshot and settings commands; per-app adapters are internal.

Verification

New tests in tests/unit/plugin/v6-compat.test.ts:

• per-app inspector trees for one plugin id (fails on main)
• setPluginSettings reaches handlers from every app
• the same handler registered twice runs once
• settings are shared across apps, and the snapshot lists the plugin once

pnpm vitest run tests/unit tests/integration passes (366 tests).

Manually checked in playground/basic with a second app that has its own Pinia (pinia 4.0.3), querying each app's pinia inspector tree:

	App 0	App 1
main	counter, lab	empty
this PR	counter, lab	widget

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commit: e1a4a9d