Chat SDK now supports Slack Enterprise Grid

Vercel's Chat SDK now supports Slack Enterprise Grid in its Slack adapter, so a bot installed org-wide can run across every workspace in the org with correct token resolution instead of being scoped to a single workspace.

• Org-wide installations are now stored by enterprise ID, and SlackInstallation exposes new teamId, enterpriseId, and isEnterpriseInstall fields.
• Token resolution for incoming events, slash commands, and interactive payloads behaves the same over HTTP webhooks and Socket Mode.
• Events route by the installation identity in the envelope's authorizations field, keeping routing correct for Slack Connect shared channels.
• User profile and mention caches are scoped per installation, so one tenant's data never resolves for another.
• API calls made with an org-wide token automatically pass the event's team_id, which Slack requires for workspace-scoped methods.
• Retried event deliveries are deduplicated for 24 hours, covering Slack's Delayed Events redeliveries.
• Outgoing mentions now accept W-prefixed Grid user IDs alongside U-prefixed IDs.

Single-workspace installations are unaffected, and getInstallation and deleteInstallation work unchanged for both install types.

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