feat: implement default query helpers

[wheval]

Summary

• Centralized public list query default values into a single helper and updated public list handlers to import those defaults instead of repeating inline defaulting logic.

Closes #48

Testing

• pnpm lint
• pnpm build
• pnpm exec prisma generate when schema or generated types changed

Checklist

• Linked issue or backlog item
• No secrets or live credentials added
• Docs updated if setup or env changed
• Change is scoped to one problem

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