[CLI] Post-deploy output — live URL, share CTA, name reveal, moddable nudge, docs link

[ottovlotto]

Per spec v0.12 backlog #12 / User Journey step 7. Today the CLI only shows signer/build/domain after deploy. Spec calls for the full post-deploy block:

• Live URL (clickable): yourapp.dot.li
• Detail page link: playground.dot/app/yourapp.dot
• Primary CTA "Share your app — let others mod it" → copies playground detail page link
• "Your app is live on Bulletin Chain, registered on Polkadot Hub, accessible at yourapp.dot.li. Nobody controls this but you."
• Name reveal: "You're live as <name>. Change your name in playground.dot → My Profile."
• Moddable nudge if not moddable: "Make your app moddable — connect your GitHub repo so others can build on your work, and so you keep your code after the Summit ends."
• Docs link: "Learn more about building on Polkadot → [docs link]"

Spec OQ #19 — confirm docs URL with DevRel.