Summary: ModelArts adds real-time customer service link

Why It Matters: This change makes it easier for users to get help right away.

What Changed:

• A "实时客服" (Real-time Customer Service) link was added under the admin menu.
• The "工单管理" (Ticket Management) link moved down one spot.
• The "个性化推荐管理" (Personalized Recommendation Management) link was removed.
• The "快速入门" (Quick Start) section updated its content:
  • "免费体验：一键完成商超商品识别模型部署" (Free trial: One-click completion of supermarket product recognition model deployment) was removed.
  • "ModelArts业务选型" (ModelArts Business Selection) was added.
• The "最佳实践" (Best Practices) section updated its content:
  • "开发环境" (Development Environment) was removed.
  • "模型训练" (Model Training) was removed.
  • "推理部署" (Inference Deployment) was removed.
  • "LLM大语言模型推理" (LLM Large Language Model Inference) was added.
  • "LLM大语言模型训练" (LLM Large Language Model Training) was added.
  • "视频生成模型训练推理" (Video Generation Model Training and Inference) was added.