fix(helpers): handle any type in RequiredKeysOf

[jtomaszewski]

Problem

When using createClient<any>() with placeholder or fallback OpenAPI types, TypeScript incorrectly requires the second parameter in API calls:

// With placeholder types: export type paths = any;
const client = createClient<any>({ baseUrl: '...' });

// Error: Expected 2 arguments, but got 1
client.GET('/users/me');

This is problematic in scenarios where:

• Docker builds need to work without the actual OpenAPI spec file
• Using placeholder/fallback types during development
• Gradual migration to OpenAPI-based type systems

Root Cause

The RequiredKeysOf type helper doesn't properly handle the any type. When RequiredKeysOfHelper<T> evaluates to any, the current implementation doesn't recognize it as "no required keys", causing TypeScript to treat parameters as required.

Solution

Add an additional conditional check in RequiredKeysOf:

RequiredKeysOfHelper<T> extends any ? never

This ensures that when the type parameter is any, RequiredKeysOf correctly returns never, indicating no required keys. This makes the second parameter optional in API calls.

Impact

• ✅ Fixes type errors when using createClient<any>()
• ✅ Enables Docker builds with placeholder OpenAPI types
• ✅ Maintains backward compatibility for all existing use cases
• ✅ No changes to runtime behavior (types only)

Relates to #1778

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[jtomaszewski]

FYI I've added some tests and fixed all CI checks.