feat(verify): run the browser specs against a SvelteKit app

[Bccorb]

Runs the browser conformance specs against a SvelteKit app, for the browser project item of fells-code/seamless-auth-react#172 (under fells-code/seamless-auth-api#371).

What changes

• New layers. svelte and svelte-dev Playwright projects point at the existing ./react specs, as angular and vue do.
• Reference app in verify/svelte-app. It runs SvelteKit 3 with adapter-static as a single-page app (the top of the binding's SvelteKit range), built from its own Dockerfile:
  • The runtime target serves the app with nginx, with /health and a runtime config.js.
  • The dev target runs vite dev.
  • The app serves /health itself through a prerendered endpoint, because SvelteKit's dev server has no fallback page for the harness to wait on.
• Routing. The app joins REFERENCE_APPS, overridable with SEAMLESS_SVELTE_DIR. A web template whose verify.project or framework is svelte uses the new runtime.
• --local packs @seamless-auth/client and @seamless-auth/svelte into verify/svelte-vendor.
• Reporting. The summary and the matrix reporter know the new layers. There are also compose services and CI cache scopes for them.

Checks (real output)

npx tsc --noEmit -p .   # no errors
npx vitest run          # Test Files 61 passed | 1 skipped (62) / Tests 1245 passed | 4 skipped (1249)

node dist/index.js verify --local --dev was run against this branch, seamless-auth-api, seamless-auth-server and seamless-templates at origin/main, and seamless-auth-react at fells-code/seamless-auth-react#181. All 13 layers passed:

✔  API / adapter                              45.5s
✔  Web · react-vite (all flows)               5.2s
✔  Web (dev) · react-vite (all flows)         5.5s
✔  Web · react-oauth (@oauth)                 837ms
✔  Web (dev) · react-oauth (@oauth)           921ms
✔  Web · angular-reference (all flows)        4.8s
✔  Web (dev) · angular-reference (all flows)  7.6s
✔  Web · vue-reference (all flows)            4.7s
✔  Web (dev) · vue-reference (all flows)      4.9s
✔  Web · svelte-reference (all flows)         4.9s
✔  Web (dev) · svelte-reference (all flows)   7.9s
✔  Full-stack · nextjs (all flows)            8.0s
✔  Full-stack (dev) · nextjs (all flows)      11.0s

Merge order

This is a draft until fells-code/seamless-auth-react#181 is merged and @seamless-auth/svelte is published:

• Conformance CI: it checks out the SDK at main.
• Released smoke: it installs the published package.