feat: implement admin panel with multiple routes for user management, credits, jobs, and content moderation. Add admin dashboard for platform overview and integrate visibility controls for featured content. Enhance sidebar navigation for admin access and ensure proper session handling for admin users.
feat: enhance backend conventions for tRPC and Hono with new error handling, pagination, authorization, and logging guidelines. Introduce shared utilities for error management, ownership assertions, and visibility conditions. Update routers to utilize new pagination schema and improve error responses. Add comprehensive documentation in AGENTS.md for better developer onboarding.
