[docs] Reorganize Doris Operator Kubernetes documentation

[Al-assad]

Summary

This PR reorganizes and expands the Doris Operator documentation under the Kubernetes deployment section.

Changes include:

• Adds dedicated Doris Operator concept pages for:
  • architecture
  • resource model
  • lifecycle management
  • status and troubleshooting
• Updates the Doris Operator overview page to merge the previous introductory context with the newer conceptual structure.
• Adds clickable landing pages for:
  • Doris Operator Concepts and Capabilities
  • Preparation
• Moves cloud-specific preparation guidance into a separate Preparation category with Alibaba Cloud and AWS EKS pages.
• Updates current and 4.x docs in both English and Chinese so the active documentation sets remain aligned.
• Updates sidebar navigation and Chinese sidebar translations to reduce repeated Doris Operator prefixes in child items.
• Updates docs governance sync detection so current English and Chinese docs are included in the strong synchronization checks.

Validation

• yarn docs:links:changed
• yarn docs-governance:test
• Started the local Chinese dev server and verified the new Doris Operator landing pages are reachable.

Notes

The page URLs for the main Doris Operator content are preserved. This PR mainly changes navigation grouping, landing pages, and documentation coverage.