fix(form): render select dropdowns for array of enum string items

[lukasklier-v-sion]

Summary

Fixes #374

When a collection schema defines z.array(z.enum([...])), the form editor now renders select dropdowns for each array item instead of falling back to free-text inputs.

The enum options were already correctly propagated through schema parsing (buildFormTreeFromSchema → arrayItemForm), but InputArray.vue ignored them when rendering string items.

Changes

• Detect options on the array item's FormItem (same pattern as InputText.vue)
• Add a new template section for enum string arrays that renders USelect per item with reorder/delete controls
• Skip auto-focus on add for enum arrays since the selects are always visible

Before / After

Before: z.array(z.enum([...])) → text inputs (arbitrary strings allowed)
After: z.array(z.enum([...])) → select dropdowns (constrained to enum values)

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