Add purchased domains CLI management

[m-abdelwahab]

Summary

Adds railway domains for managing Railway-purchased domains from the CLI.

This is separate from the existing singular railway domain command, which manages service-attached domains. The bare railway domains command intentionally requires a subcommand.

Purchasing and transferring domains are not implemented in the CLI. Search results provide a browser handoff to railway.com/domains.

Command Surface

# Search and availability
railway domains search [query...] [--limit N] [--json]
railway domains check <domain...> [--json]

# Owned domain inventory
railway domains list [--workspace <id-or-name>] [--status active|purchasing|expired|refunded|all] [--json]
railway domains ls [--workspace <id-or-name>] [--status active|purchasing|expired|refunded|all] [--json]
railway domains status <domain-or-id> [--workspace <id-or-name>] [--json]

# Auto-renew
railway domains auto-renew status <domain-or-id> [--workspace <id-or-name>] [--json]
railway domains auto-renew enable <domain-or-id> [--workspace <id-or-name>] [--json]
railway domains auto-renew disable <domain-or-id> [--workspace <id-or-name>] [--json]

# DNS records
railway domains dns list <domain> [--workspace <id-or-name>] [--json]

railway domains dns create <domain> \
  --type A|AAAA|ANAME|CNAME|MX|NS|SRV|TXT \
  --host <host> \
  --answer <value> \
  [--ttl <seconds>] \
  [--priority <number>] \
  [--workspace <id-or-name>] \
  [--json]

railway domains dns update <domain> <record-id> \
  --type A|AAAA|ANAME|CNAME|MX|NS|SRV|TXT \
  --host <host> \
  --answer <value> \
  [--ttl <seconds>] \
  [--priority <number>] \
  [--workspace <id-or-name>] \
  [--json]

railway domains dns delete <domain> <record-id> [--workspace <id-or-name>] [--yes] [--json]

# Nameserver delegation
railway domains nameservers list <domain-or-id> [--workspace <id-or-name>] [--json]
railway domains nameservers set <domain-or-id> <nameserver...> [--workspace <id-or-name>] [--yes] [--json]
railway domains nameservers reset <domain-or-id> [--workspace <id-or-name>] [--yes] [--json]

Search UX

In an interactive terminal, railway domains search opens a TUI similar to railway templates search.

• Type to search.
• Results update live through the domain search websocket.
• Rows show availability, purchase price, and renewal price with color.
• Enter selects the highlighted domain.
• If the selected domain is purchasable, the CLI opens:
  https://railway.com/domains?q=<domain>&purchase=true
• The URL is also printed as a fallback for SSH/headless environments.

Non-interactive and JSON behavior remains script-friendly:

railway domains search example --limit 10 --json
railway domains check example.com example.dev --json

Implementation Notes

• Reuses the Railway domains websocket endpoint for search/check: wss://backboard.railway.com/domain-search
• Search prices are parsed as decimal dollar values, matching the websocket response.
• JSON search/check results include purchaseUrl only for purchasable domains.
• Account-scoped operations use the GraphQL API for purchased domain inventory, DNS records, auto-renew, and nameserver delegation.
• --json workspace resolution avoids interactive/fake-select output so JSON stays valid.
• Nameserver validation allows 2-13 nameservers, matching the API schema.
• Destructive operations require --yes in non-interactive mode.

Testing

cargo test domains::tests
cargo test purchased_domains_subcommands
cargo build --bin railway
cargo check
git diff --check

Also smoke-tested:

• public domain search/check against the live websocket
• authenticated domains list against a real Railway account
• TUI search in a pseudo-terminal
• Enter selection browser handoff fallback in a headless environment