[Feature Request] Allow Fabric data apps (Rayfin data app template) to be included in published Power BI / Fabric apps (org apps)

Problem statement

Data apps built with the Rayfin data app template can currently only be opened from inside the Fabric workspace by users with workspace access. They can't be added to a published Power BI app for distribution:

• Workspace apps only allow Power BI items (reports, dashboards, paginated reports).
• Org apps (preview) currently support reports, paginated reports, notebooks, maps, and real-time dashboards — but not data apps / Fabric App items.

As a result, a dashboard built as a data app can't be distributed to a broad audience of consumers the way a report can. Every viewer needs direct workspace access, which doesn't fit the standard "publish an app to an audience" BI distribution model.

(Distinct from #33, which is about opening a data app in its own browser window outside the Fabric portal. This request is specifically about including a data app as content inside a published Power BI app.)

Proposed solution

Add Fabric App (data app) as a supported item type in published Power BI apps — ideally org apps first — so a data app can be:

• added to an org app alongside reports,
• shown in the app navigation, and
• opened by app consumers who have the appropriate semantic-model Build/Read permissions, without requiring direct workspace membership.

Reuse the data app's existing auth/permission model (semantic model Build + Read via the Execute DAX Queries API).

Alternatives considered

• Embedding the deployed static app URL — not viable today: apps connected to semantic models error when opened outside the Fabric portal (#33 / documented known limitation).
• Granting all consumers workspace viewer access — doesn't scale and bypasses curated app distribution.
• Rebuilding the dashboard as a Power BI report — defeats the purpose of the data app.

Additional context

• Data app template known limitations: workspace-/Fabric-portal-only access — https://learn.microsoft.com/en-us/fabric/apps/data-apps-template
• Org apps supported item types (which don't include data apps yet) — https://learn.microsoft.com/en-us/power-bi/explore-reports/org-app-items
• This may ultimately be a Fabric platform capability (Power BI Apps item-type support) rather than the Rayfin CLI itself; filing here as the data app's home, happy to cross-post to Fabric Ideas.