Fix selectize maxOptions limit for large option lists

[superdav42]

Summary

• The selectize library defaults to maxOptions: 1000, which silently hides options beyond that limit in dropdowns
• This causes the Domain Seller addon's TLD selector to stop at ~.space alphabetically after syncing 1500+ TLDs from a provider
• The fix counts actual <option> elements in each [data-selectize] select and raises maxOptions when needed

Test plan

• Sync TLDs from a domain provider (OpenSRS/Namecheap) to get 1500+ TLDs
• Open Domain Seller settings → Default Search TLDs dropdown — verify all TLDs are visible past .space
• Edit a domain product → Supported TLDs dropdown — verify all TLDs are visible
• Verify other selectize dropdowns (e.g. currency, country) still work normally

🤖 Generated with Claude Code

Summary by CodeRabbit

• Improvements
  • Enhanced dropdown component performance when handling large option lists (1000+ items).
  • Improved initialization sequence for better reliability and reactivity.
  • Added support for dynamic template rendering and option loading for dropdowns.

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