Add hosted API docs link

[dcrawbuck]

Adds a hosted API docs entry to the docs overview and shared layout tabs.
The tab is labeled API, opens https://api.superwall.com/docs externally, and is available in the compact mobile/iPad tab dropdown because it is now part of the shared DocsLayout tab list.
Internal overview cards still use router links, while external cards render as safe anchors with noopener/noreferrer.
Validated with bun run build:cf, bun test, and autoreview.

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Note

Low Risk
Navigation and presentation only; no auth, data, or API behavior changes.

Overview
Adds a discoverable link to the hosted API reference at https://api.superwall.com/docs from the docs home and from every docs page navbar.

On doc pages, tab building moves out of sidebar.tabs into getDocsLayoutTabs, which uses fumadocs getLayoutTabs with the same SDK-aware URL and icon behavior as before, then appends an API tab (Code icon) that opens externally with target="_blank" and rel="noreferrer noopener". Those tabs are passed to DocsLayout via the top-level tabs prop so the API entry shows in the shared navbar / compact tab UI.

On the docs overview, a new API card sits with the other documentation sections. OverviewCard now treats absolute URLs as external and renders a plain anchor instead of a router Link, while internal paths still use client navigation.

^{Reviewed by Cursor Bugbot for commit 2d0c36b. Bugbot is set up for automated code reviews on this repo. Configure here.}

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	superwall-docs-staging	2d0c36b	Commit Preview URL Branch Preview URL	Jun 10 2026, 10:29 PM