docs: add Hy3 and update DeepSeek pricing

[ai-bankofai]

Summary

• Add English and Chinese Hy3 model documentation, pricing, navigation, and limited-time free promotion.
• Document Hy3 standard pricing: 0.132 input, 0.033 cache read, and 0.528 output.
• Update DeepSeek-V4-Flash and DeepSeek V4 Pro to Idle and Busy time-based pricing.
• Clarify the Credits-to-USD pricing conversion and active-promotion display order.
• Bump the documentation version from 1.3.22 to 1.3.23.

Validation

• yarn build (English and Chinese builds completed successfully; existing unrelated broken-link warnings remain).