refactor: 横屏提示与缩放改为组件标签（OrientationGuard）

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/components/common/LandscapePrompt/LandscapePrompt.tsx

@@ -1,25 +0,0 @@
-export function LandscapePrompt() {
-	return (
-		<div className="fixed inset-0 z-2000 flex items-center justify-center bg-gray-950/80 px-8 text-white">
-			<div className="text-center">
-				<div className="mx-auto mb-2 flex h-16 w-16 items-center justify-center">
-					<svg
-						aria-hidden="true"
-						className="h-full w-full text-white"
-						fill="none"
-						viewBox="0 0 24 24"
-						stroke="currentColor"
-						strokeWidth={1.5}
-					>
-						<rect x="2" y="5" width="20" height="14" rx="2" />
-						<circle cx="12" cy="12" r="1" fill="currentColor" />
-					</svg>
-				</div>
-				<h1 className="text-2xl font-semibold">请旋转屏幕</h1>
-				<p className="mt-3 text-base text-gray-400">
-					为获得最佳体验,请横屏浏览
-				</p>
-			</div>
-		</div>
-	);
-}

src/components/common/LandscapePrompt/index.ts

@@ -1 +0,0 @@
-export { LandscapePrompt } from "./LandscapePrompt";

src/components/common/index.ts

@@ -31,5 +31,4 @@ export type {
 	SpotlightController,
 } from "./GuideSpotlight";
 export { defineSpotlight, GuideSpotlight } from "./GuideSpotlight";
-export { LandscapePrompt } from "./LandscapePrompt";
 export { RouteError, RouteFallback } from "./RouteFallback";