[2026-04-16][feat][general] implement plan pricing tiers with billing intervals and enforce feature usage limits across data-plane services.

👤 Author : Matoraaa
🌿 Branch : master
🔗 Commit : 119e7f7
📅 Date : 2026-04-16
📝 Note :
feat: implement plan pricing tiers with billing intervals and enforce feature usage limits across data-plane services.