Replace SMTP sender modes with From templates

[7heMech]

Each site's From is now a single template, so the "Force one address" / "Allow site domains" choice is gone.

Token	Value
{site}	The CloudPanel site's domain
{from.local}	The name part of the From the app asked for, if its domain is allowed; otherwise noreply
{from.domain}	The app's domain, kept only if it's the site's own or a granted domain

• noreply@{site} is the default. {from.local}@{site} keeps wordpress@ / orders@ on the site's domain.
• A requested From on a foreign domain (a contact form's visitor) is sent as noreply@ the site, with the original in Reply-To, instead of the message being rejected. Display names are kept.
• Postfix's local sender map follows from the template: an exact address, or the whole domain when {from.local} is used.
• The test mail runs as the site's Unix account through smtp-submit, so it covers the PHP path. There's an optional field for the From the app asks for.
• Saving updates the page from the reply instead of calling location.reload().
• preview:shot now installs Chromium with bunx --bun, because Playwright refuses Node 18.

Verified on staging: PHP mail() through the site's FPM pool and the test action both queued with the expected From, envelope sender and Reply-To. Staging was reset to unconfigured afterwards.

🤖 Generated with Claude Code

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[github-actions]

Staging is running this pull request as of b60c200. It stays until the next deploy from dev or from another pull request.