Apply the user's explicit address correction to the PHP recipient, Help links, contact form and tests. Refresh the form URL and PWA cache. Exact-recipient PHP tests and support/Help browser tests passed in isolated run 35575721587. No real mail sent, delivery not claimed. Keep standard main QA and production publication gates unchanged; no auth, database or unrelated feature changes.
Add Help contact form and PHP mail endpoint for support@katerion.ru, with validated Reply-To, explicit diagnostics consent, CSRF/origin checks, hashed rate limits and duplicate protection. Preserve drafts on error and avoid serializing customer data or SDK internals. Full PR QA passed in 35559317001; isolated PHP and 30 browser cases passed in 35559179372. Standard production gates unchanged. Publication checks do not send real mail; inbox receipt remains unverified. No training photo assets or unfinished training lifecycle changes.
