[Feature][Site] Improve site navigation and update platform documentation

[Gautam25Raj]

Summary

This PR improves the public site navigation experience with dedicated desktop and mobile navigation components while also updating platform documentation and ecosystem references.

Feature

Navigation Improvements

• Added DesktopNav component for desktop navigation
• Added MobileNav component for responsive mobile navigation
• Introduced NavActions for navbar action handling
• Added NavLogo component for branding consistency
• Created centralized NAVIGATION_ITEMS configuration

Enhancement

UI Improvements

• Improved ThemeToggle functionality and styling
• Enhanced navbar structure and responsiveness

##[Docs

• Updated API documentation for improved clarity
• Updated agent.json with new platform details and features
• Refactored llms.txt to reflect updated ecosystem and architecture

Notes

• No breaking changes expected
• Focused on improving navigation, usability, and documentation consistency

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🧪 Tests (adding or updating tests)

Checklist

• I have read the CONTRIBUTING.md document.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• Any dependent changes have been merged and published in downstream modules.