feat: differentiate DNS guidance by hosting mode, remove DIY DNS record creation

[pcfreak30]

When DNS hosting is enabled, the server creates the DNS zone and records
automatically when DnsHostingEnabled is set. The CLI no longer duplicates
this work by calling CreateZone/CreateRecord.

Wizard changes:

• Remove dnsService from WebsitesWizard (server handles DNS setup)
• Replace executeDNSSetup with NS delegation instructions only
• Managed DNS validation retries with exponential backoff (5 attempts,
  2s-15s) with spinner, since server creates records asynchronously
• On retry exhaustion, explain NS propagation delay + validate command
• State-aware completion message (not 'validated' when validation failed)
• Remove redundant DNS/vvalidation output after wizard completes

Non-wizard changes:

• Add showDNSHostingInstructions/showSelfManagedDNSInstructions split
• Add getNameservers to fetch NS records from API
• Move 'Then validate' hint to non-wizard call sites only
• Update ipfs-sdk to v0.1.43

---

This PR differentiates DNS setup guidance based on the website's hosting mode and removes the client-side automatic DNS record creation, which is now handled server-side.

Key changes:

• Differentiated DNS instructions by hosting mode: When DNS hosting is enabled (Pinner-managed), the CLI now shows NS delegation instructions telling users to update their domain's nameservers at their registrar. For self-managed DNS, it continues showing the TXT verification and dnslink CNAME records users must add manually.

• Removed client-side DNS zone/record creation: The setupDNSHosting function and DNSService dependency have been removed from the wizard and CLI commands (websites create, websites update). The server now automatically creates DNS zones and records when a website is created with DnsHostingEnabled=true, so the client no longer needs to make those API calls.

• Managed DNS validation with retry: The wizard's validation step now uses exponential backoff retries (5 attempts) with a spinner for managed DNS, since the server creates DNS records asynchronously and propagation takes time. Self-managed DNS validation continues to prompt the user to add records first.

• Enhanced websites config output: Now displays nameservers alongside the gateway domain, and shows both CNAME and NS record tables when applicable.

• Updated websites validate output: The required_records JSON output and CLI instructions now reflect the hosting mode — NS records for managed DNS, TXT/CNAME records for self-managed DNS.

[kody-ai]

Found critical issues please review the requested changes

• Nil pointer dereference when ValidationResult returns nil in managed DNS validation retry loop

[github-actions]

Code Coverage Report

Total Coverage: 35.0%

Generated from commit: 34f7eb5
Repository: LumeWeb/pinner-cli

[kody-ai]

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