`@zenstackhq/zod` scalar array types are incorrect

[haltcase]

Description and expected behavior
A clear and concise description of what the bug is and what's the expected behavior.

The TypeScript definition for inferring a Zod schema type from a Zen schema is incorrect for scalar arrays like String[]. The array-ness is lost, and the Zod types report z.ZodString instead of z.ZodArray<z.ZodString>.

This seems to be due to a missing ZodArrayIf in the scalar branch here:

zenstack/packages/zod/src/types.ts

Lines 22 to 29 in 00768de

	export type GetModelFieldsShape<Schema extends SchemaDef, Model extends GetModels<Schema>> = {
	// scalar fields
	[Field in GetModelFields<Schema, Model> as FieldIsRelation<Schema, Model, Field> extends true
	? never
	: Field]: ZodOptionalAndNullableIf<
	MapModelFieldToZod<Schema, Model, Field>,
	ModelFieldIsOptional<Schema, Model, Field>
	>;

This means types do not match runtime, where the Zod schema is actually correct, because applyCardinality is used properly in makeScalarFieldSchema here:

zenstack/packages/zod/src/factory.ts

Line 174 in 00768de

return this.applyCardinality(base, fieldDef);

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Environment (please complete the following information):

• ZenStack version: 3.4.6 with @zenstackhq/zod@3.4.6
• Database type: any
• Node.js/Bun version: any
• Package manager: any

Additional context
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