docs: Hub-based architecture README overhaul #107

Summary

Both README.md and README_zh.md have been updated to reflect the new Hub-based interactive sample browser architecture. This issue serves as a tracking card for the documentation changes and any follow-up improvements.

Completed (PR #106)

• Rewrite repository structure to match current Hub + Samples layout
• Update .NET version from 8.0 to 10.0
• Replace old start.cmd/oss_start.cmd with Run.cmd/Run.ps1 instructions
• Add interactive sample browser menu documentation
• Add sample catalog table with all 9 samples
• Document ISample interface and contribution guidelines
• Update Chinese README (README_zh.md) in sync

Potential Follow-ups

• Add a GIF/screenshot of the Hub interactive menu to the README
• Document each sample's CleanPaths and expected output in more detail
• Add troubleshooting section for common issues (e.g., server port conflicts)
• Document the appsettings.json configuration options
• Add a contribution quick-start for adding a new sample from scratch

Related

• PR: docs: update READMEs to reflect Hub-based interactive sample browser #106
• Hub project: src/Hub/
• Server project: src/Server/

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