Migrate ct_lists_all() to generic requests + promote to stable

## Context

Inline TODO at `R/ct_lists_all.R:1` — migrate from custom httr2 implementation to `generic_request()` template and promote lifecycle to stable after testing.

## Tasks

- [ ] Refactor `ct_lists_all()` to use `generic_request()`
- [ ] Verify all endpoints work with new template
- [ ] Update VCR cassettes
- [ ] Promote lifecycle from experimental to stable