chore(deps): vendor the free-email domain list and drop unused packages (#6032)

* chore(deps): vendor the free-email domain list and drop unused packages

- vendor free-email-domains: its postinstall downloads a CDN CSV and
  overwrites its own domains.json, so the lockfile hash covers the
  tarball but not the installed data
- drop tailwind-merge and autoprefixer from apps/sim, which imports
  neither (emcn and docs declare their own tailwind-merge; postcss.config
  loads only tailwindcss)

* fix(email): split two fused domain entries in the vendored list

Upstream joins mail2moldova.com/mail2molly.com and
smileyface.com/smithemail.net into one entry each, a CSV line-join
artifact that made all four read as work addresses. Splitting them keeps
the list sorted and adds a guard against a naive refresh.

Author: waleedlatif1