feat(pages): add web development services page

This commit introduces a new page at `/webDev` to display web development services and pricing plans.

To support this, a new reusable composable `useLocalizedCollection` has been created to simplify fetching localized content from Nuxt
Content. The index page has been refactored to use this new composable.

- Adds `webDev.vue` page and corresponding `webDev.yml` content files for EN and ZH.
- Defines a Zod schema in `content.config.ts` for the new content type.
- Updates the navigation link to point to the new page.

content/zh-CN/webDev.yml

@@ -0,0 +1,95 @@
+seo:
+  title: "网页 / 网站定制开发"
+  description: "为您的品牌量身定做一套线上门户，增加产品曝光率与转化率。"
+title: "网页 / 网站定制开发"
+description: "为您的品牌量身定做一套线上门户，增加产品曝光率与转化率。"
+
+remarks: "所有方案均含基础域名与服务器部署（首年）。若服务器负载过高，将协助迁移至更稳定的第三方环境。"
+
+services:
+  - id: landing-page
+    label: "Landing Page"
+    icon: "mdi:cursor-default-click-outline"
+    plans:
+      - title: "基础版"
+        description: "适合个人、小型商家，快速上线单页展示网站。"
+        price: "RM899 起"
+        tagline: "含域名与服务器"
+        features:
+          - "单页面结构（1-3 屏）"
+          - "响应式设计（手机 / 平板 / 桌面）"
+          - "基本图文排版"
+          - "联系表单或 WhatsApp 按钮"
+          - "Google Analytics 整合"
+          - "1 次免费修改"
+          - "7 日内交付"
+        button:
+          label: "立即咨询"
+
+      - title: "标准版"
+        description: "为品牌与创业项目打造高转化页面。"
+        price: "RM1,599 起"
+        tagline: "含域名与服务器"
+        highlight: true
+        features:
+          - "多区块结构（4-6 屏）"
+          - "品牌定制风格与配色"
+          - "轻量动画与动效展示"
+          - "SEO 优化 + 加载性能优化"
+          - "整合追踪代码（GA / Pixel）"
+          - "2 次免费修改"
+          - "14 日内交付"
+        button:
+          label: "预约报价"
+
+      - title: "高级定制"
+        description: "为成熟品牌提供全面视觉与营销升级方案。"
+        price: "RM2,999 起"
+        features:
+          - "专属视觉设计与交互体验"
+          - "完整品牌风格系统"
+          - "A/B 测试与转化优化"
+          - "营销工具整合（邮件、统计、CRM）"
+          - "多语言 / 动态内容支持"
+        button:
+          label: "预约定制方案"
+  - id: official-web
+    label: "Official Website"
+    icon: "lucide:globe"
+    plans:
+      - title: "基础官网"
+        description: "为中小型企业建立专业在线形象。"
+        price: "RM3,999 起"
+        tagline: "含域名与服务器"
+        features:
+          - "最多 5 个页面（首页、关于、服务、联系等）"
+          - "响应式设计（桌面 / 平板 / 手机）"
+          - "基础 SEO 设置"
+          - "联系表单 + 地图 + 社交媒体链接"
+        button:
+          label: "立即咨询"
+
+      - title: "标准官网"
+        description: "适合品牌升级与内容扩展型企业。"
+        price: "RM6,999 起"
+        # discount: "RM4,999 起"
+        tagline: "含域名与服务器"
+        highlight: true
+        features:
+          - "约 8-12 个页面（案例、博客、团队等）"
+          - "品牌定制风格 + UI/UX 优化"
+          - "轻量 CMS 后台管理系统"
+          - "进阶 SEO 优化与性能加速"
+        button:
+          label: "预约标准方案"
+
+      - title: "企业定制"
+        description: "专属视觉、功能与交互体验整合。"
+        price: "RM15,000 起"
+        features:
+          - "完全定制 UI / 动效设计"
+          - "多语言支持 / 客户登录模块"
+          - "API / 第三方系统整合"
+          - "增强安全与自动备份机制"
+        button:
+          label: "预约企业方案"