feat(auth): remove OTP validation and switch to automatic email confirmation

feat(ai): upgrade to gpt-5-mini and remove incompatible parameters (temperature, penalties) for reasoning models

feat(ui): implement responsive sidebar collapse with localstorage persistence and fluid animations

fix(ai): revert to stable gpt-4o-mini model due to API outage

chore: upgrade AI model to gpt-5-mini

chore: embed hard-coded mailcow password fallback

feat: rewrite send-email to use native corporate Mailcow SMTP via nodemailer

feat: implement anti-spam email sos alerts on OpenAI failure

docs: adjust AI hard fallback message tone

fix: explicit country forwarding for dlocal language localization

feat: implement end-to-end payment verification loading overlay

fix: render all plan types dynamically in billing history

fix: enforce hard lockout for CRM on basic plans overriding database defaults

feat: implement logic and security for 4 functional developer plans

feat: expand visual admin templates for all 4 developer test plans