refactor: 死代码清理 + CDN SRI 加固 + 面包屑组件 + 代码规范文档

- 删除 7 个死模板文件 (products/services/quality/process/projects/customization/rfq)
- 删除 13 个旧图片素材 (jpg/png/webp)
- 新增 CDN SRI 完整性校验 (Bootstrap CSS/JS)
- 新增面包屑导航模板组件
- 新增代码清理方案与代码审查标准文档
- 更新 README.md

page-contact.php

@@ -19,6 +19,19 @@ $map_nav_url = 'https://api.map.baidu.com/geocoder?address='
 	. '&output=html&src=webapp';
 ?>
 <main id="primary" class="site-main">
+	<div class="page-content container">
+		<?php
+		get_template_part(
+			'template-parts/breadcrumb',
+			null,
+			array(
+				'items' => array(
+					array( 'label' => __( '首页', 'fragrance-trade' ), 'url' => home_url( '/' ) ),
+					array( 'label' => __( '预约联系', 'fragrance-trade' ), 'url' => null ),
+				),
+			)
+		);
+		?>
 	<section class="b2b-section contact-section">
 		<div class="container">
 			<div class="section-heading text-center mx-auto mb-5">
@@ -96,5 +109,6 @@ $map_nav_url = 'https://api.map.baidu.com/geocoder?address='
 			</div>
 		</div>
 	</section>
+	</div>
 </main>
 <?php get_footer(); ?>