API: Get Current User

type Response = {
  success: true,
  result: {
    // The authenticated user's unique ID
    userId: string,
    // The user's registered email address
    email: string | null,
    // Current subscription plan: "Free", "Standard", "Pro", or "Enterprise"
    plan: string,
    credits: {
      // Remaining view credits for the current billing period (-1 means unlimited)
      view: number,
      // Remaining AI processing credits for the current billing period, resets monthly (-1 means unlimited)
      aiProcessing: number,
      // Remaining purchased AI processing credits (never expire)
      aiProcessingAddOn: number,
    },
  },
}