Preserve template application_url during app creation

[MitchLillie]

Summary

• Threads applicationUrl and redirectUrls from template config through CreateAppOptions to both Partners and App Management platform clients
• When shopify app init uses an extension-only template, the template's application_url (https://extensions.shopifycdn.com) is now sent to the platform at creation time instead of a hardcoded https://example.com placeholder
• Falls back to existing defaults when no template URL is present (fully backward compatible)

Fixes shop/issues-admin-extensibility#2395

What was happening

1. app init clones the extension-only template which has application_url = "https://extensions.shopifycdn.com"
2. loadConfigForAppCreation() reads the template TOML but discards application_url
3. createApp() sends hardcoded https://example.com to the platform
4. link() deep-merges remote config over local — remote wins for scalars, so example.com overwrites the template URL in the local TOML

This also affects --reset: fetchAppRemoteConfiguration() returns undefined for Partners-based apps, so the fallback uses remoteApp.applicationUrl — the creation-time value that deploy never updates. By fixing the creation-time URL, --reset also returns the correct value.

Changes

File	Change
developer-platform-client.ts	Added applicationUrl and redirectUrls to CreateAppOptions interface
loader.ts	loadConfigForAppCreation() now extracts application_url and auth.redirect_urls from template TOML
app.ts	creationDefaultOptions() includes applicationUrl and redirectUrls for the link() code path
partners-client.ts	getAppVars() uses options.applicationUrl ?? defaultAppUrl with ?? fallback; simplified from branching if/else to single return
app-management-client.ts	createAppVars() uses options.applicationUrl ?? defaultAppUrl and options.redirectUrls ?? [defaultRedirectUrl]
loader.test.ts	2 new tests for URL extraction from template config
partners-client.test.ts	1 new test for custom URL passthrough
app-management-client.test.ts	1 new test for custom URL passthrough

Test plan

Automated:

pnpm install
pnpx vitest run packages/app/src/cli/models/app/loader.test.ts
pnpx vitest run packages/app/src/cli/utilities/developer-platform-client/partners-client.test.ts
pnpx vitest run packages/app/src/cli/utilities/developer-platform-client/app-management-client.test.ts

Manual — extension-only template:

# From the CLI repo root, init a new app using the extension-only template
pnpm shopify app init --template https://github.com/nicely-formed/shopify-app-template-extension-only --name test-preserve-url

# Inspect the generated TOML — application_url should be https://extensions.shopifycdn.com
cat ~/Desktop/test-preserve-url/shopify.app.toml

# Verify --reset preserves the URL
cd ~/Desktop/test-preserve-url
pnpm shopify app dev --reset
# Select the same app, check the TOML again — should still show extensions.shopifycdn.com

Manual — standard template (regression check):

# Init with default template to ensure no regression
pnpm shopify app init --name test-standard-app

# application_url should be https://example.com (default for launchable apps)
cat ~/Desktop/test-standard-app/shopify.app.toml

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