feat(routes-f): stream extensions and widget overlay endpoint

[davedumto]

Overview

Implement app/api/routes-f/stream/extensions/route.ts for third-party extension/widget overlays on a stream.

Scope

• GET /api/routes-f/stream/extensions — list enabled extensions for authenticated creator
• POST /api/routes-f/stream/extensions — enable an extension (extension_id, position: overlay|panel, config object)
• PATCH /api/routes-f/stream/extensions/[id] — update extension config or position
• DELETE /api/routes-f/stream/extensions/[id] — disable extension

Acceptance Criteria

• Max 3 overlay extensions + 2 panel extensions simultaneously
• config validated against extension's JSON schema (stored per extension)
• Extensions listed in a public catalog endpoint GET /extensions/catalog
• Route lives exclusively in app/api/routes-f/stream/extensions/

Notes

Standalone — no dependency on other open issues.

[simplicityf]

@simplicityf has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi! I would love to work on this.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @simplicityf to this issue.

[FrostGraphix]

@FrostGraphix has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hey Bro, Its Frost here, can i take on this issue, I am swift so will be done before deadline.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @FrostGraphix to this issue.