refactor(content): migrate index page to Nuxt Content

This commit refactors the index page to source its content from @nuxt/content, replacing the previous implementation that used i18n
JSON files and hardcoded data within the component.

Key changes:
- Introduced `content.config.ts` to define collections and Zod schemas for type-safe content.
- Moved page content into localized YAML files (`content/en-US/index.yml` and `content/zh-CN/index.yml`).
- Updated `app/pages/index.vue` to fetch data dynamically using `useAsyncData` and `queryCollection`.
- Removed redundant content from i18n JSON files and the Vue component script.

This change decouples content from presentation, improves maintainability, and centralizes content management.

i18n/locales/en-US/index.json

@@ -1,75 +1,8 @@
 {
   "index": {
     "trustedBy": "Trusted by over {count} users worldwide",
-    "heroDescription": "Technology Meets Imagination.",
-    "capabilities": {
-      "title": "Our Capabilities",
-      "features": [
-        {
-          "title": "Custom Website Development",
-          "description": "Tailored websites and backend systems built with modern frameworks like Nuxt and Next, delivering performance, scalability, and visual impact."
-        },
-        {
-          "title": "Software & Tool Engineering",
-          "description": "Custom-built applications, internal dashboards, and automation tools that streamline workflows and enhance productivity."
-        },
-        {
-          "title": "Game Design & Development",
-          "description": "From Game Jam prototypes to commercial releases — we design and develop immersive, creative, and technically robust gaming experiences."
-        },
-        {
-          "title": "Interactive Media & Event Systems",
-          "description": "Creating dynamic, large-screen visuals and real-time interactive systems for events, exhibitions, and banquets."
-        },
-        {
-          "title": "Tech Exploration & Evaluation",
-          "description": "Experimenting with emerging technologies and evaluating software and hardware to stay ahead of the innovation curve."
-        },
-        {
-          "title": "Creative Consulting & Digital Strategy",
-          "description": "Providing expert guidance on product architecture, digital transformation, and long-term technology strategy for brands and startups."
-        }
-      ]
-    },
-    "techStack": {
-      "title": "Tech Stacks"
-    },
     "featuredProjects": {
-      "title": "Featured Projects",
       "viewDemo": "Visit Site"
-    },
-    "whyChooseUs": {
-      "title": "Why Choose Us",
-      "subtitle": "We don’t just build code — we craft digital experiences.",
-      "features": [
-        {
-          "title": "Fully Custom-Built",
-          "description": "Every website, system, and game is built from scratch to match your unique brand identity and performance needs."
-        },
-        {
-          "title": "Tech-Driven, Not Just Design",
-          "description": "Our engineers lead every project, optimizing architecture, performance, and security at every level."
-        },
-        {
-          "title": "Cross-Domain Expertise",
-          "description": "From web systems to games and interactive tools — we merge creativity and engineering to deliver seamless experiences."
-        },
-        {
-          "title": "End-to-End Service",
-          "description": "From concept, prototyping, and frontend to deployment and long-term support — we handle everything in-house."
-        },
-        {
-          "title": "Proven Project Value",
-          "description": "We’ve delivered projects for educational institutions, brands, and game developers — with real impact and measurable value."
-        },
-        {
-          "title": "Future-Oriented",
-          "description": "Beyond client work, we’re building our own products and experiments, pushing the boundaries of what’s possible."
-        }
-      ]
-    },
-    "seo": {
-      "title": "Homepage"
     }
   }
 }