feat(push): print Standby URL when actor.json.usesStandbyMode is true

[DaveHanns]

Summary

When pushing an Actor with usesStandbyMode: true in .actor/actor.json, print the public Standby endpoint alongside the Actor URL and Build URL, and expose it as actor.standbyUrl in --json output.

Rationale

Standby Actors are reachable at a deterministic host:

https://<username>--<name>.apify.actor

Today apify push prints only the Console-side Actor URL and Build URL:

Actor URL: https://console.apify.com/actors/<id>
Build URL: https://console.apify.com/actors/<id>#/builds/<n>

After enabling Standby locally there's no signal from the CLI that a public HTTP endpoint even exists — callers have to open the Console UI, or guess the <user>--<actor>.apify.actor host format. That's especially painful for automation / scripts that push then immediately want to curl the standby endpoint.

Change

In src/commands/actors/push.ts, after the build resolves:

• If actorConfig.usesStandbyMode is truthy, compute https://${actor.username}--${actor.name}.apify.actor from the Actor record we already fetched.
• Append Standby URL: <url> to the plaintext push summary (right after Build URL).
• Expose the same value as actor.standbyUrl in the --json result payload (optional field, only present when Standby is enabled locally).

Non-Standby pushes are unaffected — no extra line, no new JSON key.

Example output

Before, for a Standby Actor:

Apify push result: SUCCEEDED
Upload: SUCCEEDED
Build: SUCCEEDED
Actor ID: xxxxxxxxxxxxxxxxx
Build ID: yyyyyyyyyyyyyyyyy
Build number: 0.0.1

Actor URL: https://console.apify.com/actors/xxxxxxxxxxxxxxxxx
Build URL: https://console.apify.com/actors/xxxxxxxxxxxxxxxxx#/builds/0.0.1

After:

Apify push result: SUCCEEDED
Upload: SUCCEEDED
Build: SUCCEEDED
Actor ID: xxxxxxxxxxxxxxxxx
Build ID: yyyyyyyyyyyyyyyyy
Build number: 0.0.1

Actor URL: https://console.apify.com/actors/xxxxxxxxxxxxxxxxx
Build URL: https://console.apify.com/actors/xxxxxxxxxxxxxxxxx#/builds/0.0.1
Standby URL: https://myuser--my-standby-actor.apify.actor

Test plan

• apify push on an Actor with .actor/actor.json.usesStandbyMode = true prints Standby URL: https://<username>--<name>.apify.actor after Build URL:.
• apify push --json on the same Actor emits actor.standbyUrl with the same value.
• apify push on an Actor without usesStandbyMode prints no Standby URL: line and no actor.standbyUrl key in JSON output.

Surfaced during an evaluation of Apify surfaces for agent-driven Actor development.