fix: 当 /api/usage 返回无效数据时，fallback 到 /api/subscription#27
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修复 Issue #26：接口不返回用量数据 ## 问题 88code 的 /api/usage 接口返回的 creditLimit、currentCredits、 subscriptionEntityList 字段全是 null，导致状态栏无法正确显示用量。 ## 解决方案 采用双重保障策略：优先使用 /api/usage，失败时 fallback 到 /api/subscription 1. 添加自定义反序列化函数处理 null 值（转换为默认值） 2. 新增 is_valid() 方法判断 usage 数据是否有效 3. 新增 SubscriptionPlan 结构体解析嵌套的 creditLimit 4. 新增 from_subscriptions() 方法从订阅数据构造等价的 UsageData 5. 在 get_usage() 中加入 fallback 逻辑 6. 修复 fetch_usage_with_cache() 传入正确的 subscription_url ## 优势 - 向后兼容：88code 修复接口后自动恢复原方案 - 当前可用：接口没修复时 subscription 方案兜底 - 最小改动：原方案代码基本不动，只加判断层 Closes #26 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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johnnyee
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- 在分支列表中添加 fix/issue-26-usage-api-fallback - 在已提交的 PR 中添加 PR #27 - 添加详细的 Issue #26 修复说明文档 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
/api/usage返回无效数据（creditLimit=null, subscriptionEntityList=null）时，自动 fallback 到/api/subscription获取用量数据问题原因
88code 的
/api/usage接口返回的关键字段全是 null，导致状态栏无法正确显示用量。解决方案
采用双重保障策略：优先使用原接口，失败时 fallback
is_valid()方法判断 usage 数据是否有效SubscriptionPlan结构体解析嵌套的creditLimitfrom_subscriptions()方法从订阅数据构造等价的 UsageDataget_usage()中加入 fallback 逻辑fetch_usage_with_cache()传入正确的subscription_url优势
Test plan
Closes #26
🤖 Generated with Claude Code