New

• billing: add annual billing with 2 months free #316
• dashboard: add dark mode with toggle and localStorage #317
• dashboard: warm empty states with CTAs across 10 pages #311
• onboarding wizard and overage billing for paid plans #313
• security.txt and suppression CSV import/export #310
• status: add Vartio.dev status page integration #312
• team: add team management with roles and invitations #314
• team: auto-accept, account switcher, RBAC, invitation emails #315