Add Kilo Gateway quota provider

[wagner-sousa]

Summary

• add Kilo Gateway provider with trusted cookie config and usage/credit APIs
• register provider metadata, status output, and docs
• add focused parser/provider/display tests

Verification

• pnpm exec vitest run tests/kilo.test.ts tests/providers.kilo.test.ts tests/lib.quota-window-classification.test.ts tests/format.test.ts
• pnpm run typecheck
• pnpm run build