fix(zod): add explicit type annotations to enum schemas for isolatedDeclarations

[aaronshaf]

Summary

This PR fixes #1187 by adding explicit type annotations to generated Zod enum schemas to make them compatible with TypeScript's isolatedDeclarations compiler option.

Changes

• Added z.ZodEnum<typeof EnumType> type annotation for regular enums using z.nativeEnum()
• Added z.ZodEnum<{ VALUE: "VALUE"; ... }> type annotation for enumsAsTypes using z.enum()

Example

Before (causes TS9023 error):

export const StatusSchema = z.nativeEnum(Status);

After (works with isolatedDeclarations):

export const StatusSchema: z.ZodEnum<typeof Status> = z.nativeEnum(Status);

Test plan

• All existing tests pass (264 tests)
• Updated test expectations to match new type annotations
• Verified the generated code includes proper type annotations

Fixes #1187

🤖 Generated with Claude Code