📝 docs: 更新故事003.003状态为已完成

- 将故事003.003状态从Ready for Development更新为Completed

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Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

docs/stories/003.003.goods-price-display-fix.story.md

@@ -1,7 +1,7 @@
 # Story 003.003: 修复商品价格显示不一致问题
 
 ## Status
-Ready for Development
+Completed
 
 ## Story
 **As a** 小程序用户，