Add Eigent as first ecosystem highlight

[Copilot]

Adds Eigent to the ecosystem highlights section in the introduction documentation, positioned as the primary item.

Changes

• Added Eigent card to docs/get_started/introduction.md ecosystem highlights
• Positioned as first card in the grid
• Description: "The Best Open Source Cowork Desktop to Unlock Your Exceptional Productivity"
• Links to https://www.eigent.ai/

Result

Ecosystem highlights order:

1. Eigent (new)
2. OASIS
3. CRAB Benchmark
4. Project Loong
5. OWL 🦉

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Feature Request] Add eigent to CAMEL ecosystem intro</issue_title>
<issue_description>### Required prerequisites

• I have searched the Issue Tracker and Discussions that this hasn't already been reported. (+1 or comment there if it has.)
• Consider asking first in a Discussion.

Motivation

Add eigent to CAMEL ecosystem intro: https://docs.camel-ai.org/get_started/introduction

Solution

No response

Alternatives

No response

Additional context

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature Request] Add eigent to CAMEL ecosystem intro #3795

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