docs(go): renew DeepSeek ZDR through September 2026

[MrMushrooooom]

Summary

• Update DeepSeek ZDR agreement validity from August 31 to September 30, 2026 following the September renewal.
• Update all 36 existing notices across Go documentation and Console translations, preserving localized date formats.

Validation

• Prettier checks passed for all changed files.
• git diff --check passed.
• Confirmed no August 31 ZDR notices remain.