Ensure full-screen ads always display on the horoscope page

Introduce a `forceShow` prop to the InterstitialAd component, and utilize it in `horoscope.tsx` to make the interstitial ad appear on every visit to the horoscope page, bypassing the previous article visit counter logic.

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client/src/pages/horoscope.tsx

@@ -21,6 +21,7 @@ import {
 } from "lucide-react";
 import Header from "@/components/header";
 import Footer from "@/components/footer";
+import InterstitialAd from "@/components/interstitial-ad";
 import { InArticleAd, PageSideAds } from "@/components/adsense";
 import {
   SIGNS,
@@ -395,6 +396,7 @@ export default function HoroscopePage() {
   return (
     <div className="min-h-screen bg-background">
       <Header />
+      <InterstitialAd forceShow />
       <PageSideAds />
       <main className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-4">
         <div className="flex items-center gap-3 mb-2">