docs: remove OpenViking 1.0 wording

[iAlexKai]

Summary

• remove the unintended OpenViking 1.0 wording from the root README evaluation section
• keep the public-facing product name as OpenViking
• re-check multilingual README files to confirm the same wording is not exposed elsewhere

Testing

• grep repository docs for OpenViking 1.0
• manually verify README, README_CN, and README_JA evaluation sections

[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🏅 Score: 90

🧪 No relevant tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ Recommended focus areas for review Partial Multilingual Update PR description states multilingual READMEs were rechecked, but only README.md is updated in the diff. README_CN.md and README_JA.md may still contain 'OpenViking 1.0' wording. OpenViking has been evaluated across three scenarios: long-conversation user memory, agent experience memory, and knowledge-base QA.

[github-actions]

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