fix: add canonical URLs, unique meta descriptions, and hreflang tags

- Add canonical URL to all pages
- Fix duplicate meta descriptions across 4 pages
- Add hreflang tags for en/ja/zh-CN/x-default
- Remove llms.txt rewrite rule causing 500 error in .htaccess

contextwizard_tokushoho.html

@@ -25,6 +25,49 @@
 
 		<meta name="description" content="ContextWizard Chrome拡張機能の特定商取引法に基づく表記（通信販売に関する表示事項）" />
 
+		<!-- Canonical -->
+		<link rel="canonical" href="https://amipro.me/contextwizard_tokushoho.html" />
+
+		<!-- Hreflang -->
+		<link rel="alternate" hreflang="ja" href="https://amipro.me/contextwizard_tokushoho.html" />
+		<link rel="alternate" hreflang="x-default" href="https://amipro.me/contextwizard_tokushoho.html" />
+
+		<!-- Open Graph -->
+		<meta property="og:type" content="article" />
+		<meta property="og:title" content="特定商取引法に基づく表記 - ContextWizard - amiPro" />
+		<meta property="og:description" content="ContextWizard Chrome拡張機能の特定商取引法に基づく表記（通信販売に関する表示事項）" />
+		<meta property="og:url" content="https://amipro.me/contextwizard_tokushoho.html" />
+		<meta property="og:site_name" content="amiPro" />
+		<meta property="og:image" content="https://amipro.me/files/og-image.png" />
+
+		<!-- Twitter Card -->
+		<meta name="twitter:card" content="summary_large_image" />
+		<meta name="twitter:title" content="特定商取引法に基づく表記 - ContextWizard - amiPro" />
+		<meta name="twitter:description" content="ContextWizard Chrome拡張機能の特定商取引法に基づく表記（通信販売に関する表示事項）" />
+		<meta name="twitter:image" content="https://amipro.me/files/og-image.png" />
+
+		<!-- JSON-LD Article Schema -->
+		<script type="application/ld+json">
+		{
+			"@context": "https://schema.org",
+			"@type": "Article",
+			"headline": "特定商取引法に基づく表記 - ContextWizard",
+			"description": "ContextWizard Chrome拡張機能の特定商取引法に基づく表記（通信販売に関する表示事項）",
+			"url": "https://amipro.me/contextwizard_tokushoho.html",
+			"datePublished": "2025-12-29",
+			"dateModified": "2025-12-29",
+			"author": {
+				"@type": "Person",
+				"name": "杜 慶捷"
+			},
+			"publisher": {
+				"@type": "Organization",
+				"name": "amiPro合同会社",
+				"url": "https://amipro.me"
+			}
+		}
+		</script>
+
 		<!-- Favicon -->
 		<link rel="icon" type="image/x-icon" href="files/favicon.ico" />