bbs.profullstack.com launch kit: provisioner, custom domains, email verify, ascii-live

- setup.sh: idempotent one-shot droplet provisioner — agentbbs on :22
  (admin OpenSSH moved to :2202), rootless podman, Caddy front end for
  https://bbs.profullstack.com with tilde-style /~user homepages
- internal/sites + domain@ SSH route: self-service custom domains
  (ssh domain@host add example.com) backed by a symlink farm and an
  on-demand-TLS ask endpoint so Caddy only issues certs for mapped hosts
- internal/mail + join@ email verification: optional email at signup,
  confirmation link served by a loopback /verify endpoint behind Caddy
- internal/source + cmd/ascii-live: live video → terminal ASCII groundwork
  (docs/ascii-live.md)
- store: additive sqlite migrations (email/verify columns, domains table)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

go.mod

@@ -9,9 +9,11 @@ require (
 	github.com/charmbracelet/ssh v0.0.0-20250826160808-ebfa259c7309
 	github.com/charmbracelet/wish v1.4.7
 	github.com/creack/pty v1.1.24
+	github.com/livekit/protocol v1.46.0
 	github.com/livekit/server-sdk-go/v2 v2.16.6
 	github.com/pion/webrtc/v4 v4.2.15
 	golang.org/x/crypto v0.50.0
+	golang.org/x/term v0.42.0
 	modernc.org/sqlite v1.52.0
 )
 
@@ -59,7 +61,6 @@ require (
 	github.com/lithammer/shortuuid/v4 v4.2.0 // indirect
 	github.com/livekit/mageutil v0.0.0-20250511045019-0f1ff63f7731 // indirect
 	github.com/livekit/mediatransportutil v0.0.0-20260521165806-8004f10ad0c5 // indirect
-	github.com/livekit/protocol v1.46.0 // indirect
 	github.com/livekit/psrpc v0.7.1 // indirect
 	github.com/lucasb-eyer/go-colorful v1.3.0 // indirect
 	github.com/magefile/mage v1.17.0 // indirect