docs: improve community discoverability and trust

[andy-library]

Summary

• improve Chinese and English README first-screen navigation, badges, and calls to action
• add a structured Starter Proposal issue form and route usage questions to Discussions
• add CodeQL and dependency-review workflows with minimal permissions
• synchronize the documented repository description and Topics with live GitHub metadata

Repository configuration

• configure an English search description
• configure 20 focused GitHub Topics
• enable GitHub Discussions

Validation

• all YAML files parse successfully
• all repository-local Markdown links resolve
• git diff --check passes
• live About, Topics, Discussions, and issue labels were verified

[github-advanced-security]

You are seeing this message because GitHub Code Scanning has recently been set up for this repository, or this pull request contains the workflow file for the Code Scanning tool.

What Enabling Code Scanning Means:

• The 'Security' tab will display more code scanning analysis results (e.g., for the default branch).
• Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results.
• You will be able to see the analysis results for the pull request's branch on this overview once the scans have completed and the checks have passed.

For more information about GitHub Code Scanning, check out the documentation.