Support self-hosted Svix URL in dashboard webhooks

[igorvolocRC]

Fixes #5078

Description

This fixes Daytona dashboard webhook management for self-hosted Svix deployments.

The API already supports SVIX_SERVER_URL for server-side Svix calls, but the dashboard did not pass a self-hosted Svix API URL to svix-react. In split-route deployments, browser-side webhook management could fall back to Svix Cloud instead of the configured self-hosted Svix instance.

This change adds optional SVIX_PUBLIC_SERVER_URL, defaulting to SVIX_SERVER_URL, exposes it as optional serverUrl in WebhookAppPortalAccess, and passes it to SvixReactProvider through options.serverUrl.

Generated API clients were regenerated for the public OpenAPI response schema change.

Documentation

• This change requires a documentation update
• I have made corresponding changes to the documentation

Related Issue(s)

This PR addresses issue #5078.

Screenshots

Not applicable.

Notes

Validation completed locally:

• yarn install && yarn generate:api-client using the Nexus npm registry
• npx nx test api
• npx nx build api
• npx nx build dashboard
• yarn lint:ts

---

Summary by cubic

Adds support for a browser-facing Svix API URL in the dashboard so self-hosted deployments use the intended endpoint instead of falling back to Svix Cloud. Addresses #5078.

• New Features

  • Introduced SVIX_PUBLIC_SERVER_URL (defaults to SVIX_SERVER_URL) for browser access.
  • API now returns optional serverUrl in WebhookAppPortalAccess.
  • Dashboard passes serverUrl to svix-react via SvixReactProvider (options.serverUrl).

• Migration

  • For self-hosted Svix, set SVIX_PUBLIC_SERVER_URL to the public/proxied URL used by browsers; no change needed if it matches SVIX_SERVER_URL.

^{Written for commit a8e5450. Summary will update on new commits.}