Studio CLI: Add support for xdebug beta flag

[bcotrim]

Related issues

• Fixes STU-1165

Proposed Changes

• Add studio site set-xdebug <enable> command to enable/disable xdebug for a site
• Pass xdebug configuration to the Playground CLI when starting sites
• Respect both the beta feature flag (xdebugSupport) and per-site setting (enableXdebug)
• Add helper function isXdebugBetaEnabled() to check the beta feature flag

Testing Instructions

1. Enable the xdebug beta feature in Studio desktop app (Settings > Beta Features > Xdebug Support)
2. Build the CLI: npm run cli:build
3. Create or use an existing site: node dist/cli/main.js site create --name test-xdebug --path /tmp/xdebug-test
4. Enable xdebug for the site: node dist/cli/main.js site set-xdebug true --path /tmp/xdebug-test
5. Start the site: node dist/cli/main.js site start --path /tmp/xdebug-test
6. Verify xdebug is enabled by checking the site or PM2 logs for "Enabling Xdebug support" message
7. Test disabling: node dist/cli/main.js site set-xdebug false --path /tmp/xdebug-test
8. Restart the site and verify xdebug is no longer enabled

Edge cases to verify:

• Site starts normally without xdebug when beta flag is off
• Site starts normally without xdebug when site setting is off (even if beta flag is on)
• Error message shown when trying to enable xdebug but beta flag is off

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[nightnei]

1. If some site has xdebux already - then everything good
   
2. I tried to disable Xdebug in UI - everything behaves as normal, but it's not actually disabled - in UI, it's still enabled, and it's still indeed enabled. It seems we have regression.
3. Turning on/off xdebug via cli - doesn't reflect changes in Studio, hovever terminal doesn't print errors.

Maybe it's again solely local issues, however, I removed node_modules and did everything from scratch. @bcotrim, coudl you please double-check these two points?

[bcotrim]

2. I tried to disable Xdebug in UI - everything behaves as normal, but it's not actually disabled - in UI, it's still enabled, and it's still indeed enabled. It seems we have regression.

3. Turning on/off xdebug via cli - doesn't reflect changes in Studio, hovever terminal doesn't print errors.

Thanks for the review and feedback @nightnei
I can also replicate that. There's currently an issue with site settings not updating in the UI STU-1163 that should be fixed in #2313
I believe this issue will be resolved once that PR is merged.

[nightnei]

I believe this issue will be resolved once that PR is merged.

I see 👍 Let's merge that PR and rebase this one, and I will re-test

[bcotrim]

I see 👍 Let's merge that PR and rebase this one, and I will re-test

I updated the branch with the latest changes. Everything works for me now, can you retest please?