Add dknowc know skill

[dylanzhangzx]

Summary

• Add the Chinese community listing for 深知晓 (dknowc-know)
• Link the listing to the Qoder public source repository: https://github.com/dylanzhangzx/dknowc-know-qoder
• Document the Qoder MaaS channel registration URL and default trusted unified API settings

Validation

• Ran release check in dknowc-know-qoder
• Confirmed the source repository is public
• Verified the submitted frontmatter matches the qoder-community skills schema

Note: I could not run npm run build locally because full repository cloning repeatedly timed out in this environment.