Inttegro demos 1.2.2

Inttegro demos 1.2.2

This patch release completes the first-party live demo set and fixes the two
runtime compatibility issues found while exercising the container deployments.

Changes

• Publishes stable inttegro.dev live URLs for Django, FastAPI, Go, Rails, and
  Laravel, backed by isolated Railway services and a narrow Cloudflare edge
  router.
• Makes Django honor the trusted HTTPS proxy boundary so production form posts
  pass CSRF validation without weakening host or origin checks.
• Updates the Go demo to Inttegro SDK 4.4.1 for canonical Product decoding,
  active-price validation, and optional billing details.
• Separates verified first-party hosting from reader-owned provider templates in
  deployment metadata. A live Railway service does not imply that a public
  Railway template has been published.
• Advances every immutable suite tag, per-demo tag, deployment ref, Studio
  source permalink, and reader-owned deploy button to version 1.2.2.

Production verification

The five container-hosted demos returned healthy responses through their public
Cloudflare origins. Their configured Product and Price pairs were resolved on
the trusted server, and their checkout routes were exercised through the
Inttegro-hosted invoice handoff.

Verification stopped before payment authorization. No real payment was made.

Release safety

The dedicated API key remains only in Railway's encrypted service variables. No
credential is embedded in source, Worker configuration, build output, release
metadata, deployment refs, browser assets, or mobile bundles. Version 1.2.1
remains immutable and continues to resolve for existing Studio permalinks.