docs: add agentic payments docs

[stepskop]

Adds a page at /platform/integrations/skyfire. Dedicated to the documentation of agentic payments with Skyfire.
Also mentions the allowsAgenticUsers parameter on API's GET /store.

Based on this Notion document.

---

Note

Adds Skyfire agentic payments documentation and updates Store Actors API with allowsAgenticUsers filter and isWhiteListedForAgenticPayment field.

• API (OpenAPI)
  • Add query parameter allowsAgenticUsers (boolean) to GET /store actors listing in apify-api/openapi/paths/store/store.yaml.
  • Extend response examples with isWhiteListedForAgenticPayment on actor items.
• Docs
  • New page sources/platform/integrations/ai/skyfire.md documenting agentic payments via Skyfire:
    • MCP setup and configuration (including ?payment=skyfire and optional actors preload).
    • API usage with skyfire-pay-id header for Actor runs and data retrieval.
    • Limitations and supported-actors filtering using allowsAgenticUsers=true.

^{Written by Cursor Bugbot for commit 906522f. Configure here.}

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[janbuchar]

The OpenAPI part (for which I'm a code owner) is fine, but not the important part of the PR - that's why I removed my review request

[tobice]

Read through the documentation page and honestly, I don't have much to add there. Looks good, ship it 🚀 👍

[tobice]

Empty means return all?

[stepskop]

Yes.

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[stepskop]

I added a diagram of the whole flow to the "How It Works" section.

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