Feature Added

You can now set a monthly spending cap on your API usage. Once enabled, usage is tracked against your limit and automatically resets on your chosen billing cycle date. - Monthly spending limit — Set a dollar amount that caps total API usage across all your keys each month. - Custom reset day — Choose any day from the 1st to the 28th as your monthly cycle start date. - Per-key budgets — Optionally allocate portions of your monthly limit to individual API keys for finer-grained control. - Usage alerts — Get an email notification when your usage crosses a customizable threshold (default 80%).