refactor(sync): move autobuild core under internal

[controlado]

Moves the sync/watch service out of pkg/lolautobuild and into internal/autobuild.

The CLI and UI now build the service through adapters in cmd/lol-autobuild. Coachless, LCU, auth, recommendations, and rune helpers use the new domain and port types under internal/autobuild.

User-facing changes:

• sync and watch use sync.dry_run when --dry-run is omitted
• ui, sync, and watch reject positional args
• docs and release config now point at cmd/lol-autobuild

Tests:

• go test ./...