feat: 分站套餐卡片添加官方价格等价对比营销文案

在套餐卡片中展示与 Claude/GPT 官方价格对比的等价额度，
帮助用户直观理解套餐的性价比优势。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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