feat: full admin dashboard with CRUD and env-based admin auth

feat: implement passkey auth, OAuth, Paddle payments, and email DI

feat: replace simulated features with real implementations

feat: implement unique guest accounts via device UUID and claiming flow

feat: implement multi-provider payment architecture (Stripe, Paystack, Binance Pay, Simulator) using dependency injection

fix: replace fake Math.random() token tracking with real token counts from AI API responses

Resolve all security vulnerabilities, bug fixes, and print watermarking configurations based on product review

refactor: safe editor folding, centralize api client headers, sync cloud preferences, and add tests

refactor: Modularize frontend App.tsx into custom hooks and components and resolve Vite import.meta types