The landing page wasn't interactive because public_url resolved to
localhost, making WebSocket connections fail from remote browsers.
- Added multiple IP detection methods (socket, hostname -I, gethostbyname)
- Support --port= and --host= flag formats
- Print actual serving URL on startup
- Switch web start back to textual-serve (TUI in browser)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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