Add FAQ Structured Data and Enhance Semantic Introduction

## Context

Following the previous metadata enhancement, the application still lacks structured FAQ schema and deeper semantic clarity on the homepage.

While the base SEO metadata has been improved, search engines and AI systems can further benefit from structured FAQ content and clearer semantic framing of the tool’s research purpose.

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## Problem

Currently:

- No FAQ section exists on the homepage
- No FAQPage structured data (JSON-LD) is implemented
- The introduction does not fully semantically describe the research and AI purpose of the tool

This may limit:

- Rich search results eligibility
- AI content extraction clarity
- Structured content indexing

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## Expected Outcome

- Improved eligibility for rich search results
- Better AI-readable structured content
- Clearer semantic representation of the application
- No impact on business logic or UI stability

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I would like to work on implementing this as the next step in the SEO improvement series.

### What Needs to Be Done

## ✅ What Needs to Be Done

1. Add a minimal FAQ section on the homepage (non-intrusive design)
2. Implement JSON-LD FAQPage structured data
3. Slightly enhance semantic introduction using proper heading hierarchy
4. Ensure no UI redesign or functional changes occur

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### Resources

- [Contribution Guide - Start Here!](https://github.com/AOSSIE-Org/TODO/blob/main/CONTRIBUTING.md)
- [Discord Channel](https://discord.gg/hjUhu33uAn)

### Getting Started

- [x] I have joined the [Discord server](https://discord.gg/hjUhu33uAn) and will post updates there
- [x] I have read the [Contribution Guide](https://github.com/AOSSIE-Org/Template-Repo/blob/main/CONTRIBUTING.md)
- [x] I understand this issue is assigned on a first-come, first-served basis