docs: add copyright notice and refresh changelog

[Haruko386]

Summary

• add a concise joint copyright notice for cvrs-ys801 and Haruko386, with linked GitHub avatars
• rebuild the changelog from the repository tag chronology
• remove benchmark result tables while retaining the available architecture diagrams
• record the unreleased ApDepth V2.1 training and tooling changes

Related Issue

N/A

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor
• CI / build change
• Other

Test Results

• git diff --check origin/main...HEAD
• verified that the PR contains only NOTICE.md and CHANGELOG.md
• verified every changelog architecture image path exists
• verified both GitHub avatar endpoints return HTTP 200
• verified the changelog contains no benchmark result tables

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between de53b61 and 58e9277.

📒 Files selected for processing (2)

• CHANGELOG.md
• NOTICE.md

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