docs: Add best practices for OpenKruise workloads in multi-cluster environments (Karmada & OCM)

[abhi0324]

Summary

This PR addresses issue #2005 by adding comprehensive best practices documentation for using OpenKruise workloads in multi-cluster orchestration environments (Karmada and OCM).

Key Additions

• Karmada Integration: ResourceInterpreterCustomization scripts, installation guide, and deployment examples for all OpenKruise workloads
• OCM Integration: ManifestWork examples, hub-spoke setup, and placement strategies
• Comparison Guide: Karmada vs OCM decision matrix and migration strategies
• Troubleshooting: Common issues, debugging techniques, and FAQ section

Files Added

• docs/best-practices/multi-cluster-orchestration.md - Complete integration guide
• static/img/docs/best-practices/karmada-architecture.png - Karmada architecture diagram
• static/img/docs/best-practices/ocm-architecture.png - OCM architecture diagram

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[kruise-bot]

Welcome @abhi0324! It looks like this is your first PR to openkruise/openkruise.io 🎉

[kruise-bot]

@abhi0324: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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