新增全书字符统计与阅读百分比,并沉淀后台渲染流水线优化方案

- 新增 RDEPUBTextStatisticsCoordinator:后台单线程按章渲染统计全书字符数,footer 显示精确阅读百分比;统计未就绪时(含 PageMap 未覆盖的 loading 页)显示"计算中",不再回退旧页码
- 统计结果按 bookID + renderSignature + 章节内容哈希做磁盘缓存,布局/字号变化自动失效;缓存命中不创建 renderer
- 移除"0.8 秒翻页时间窗轮询让路"逻辑,后续由事件驱动的交互加载门替代(见方案文档 5.6 节)
- 新增 Doc/FeatureSolution/TEXT_STATISTICS_PIPELINE_OPTIMIZATION.md:三条渲染流水线收敛为"交互 + 生产者"、交互加载门、全局后台渲染预算池、后台渲染登记表、两阶段近似百分比、自适应并发的完整优化方案与验收标准

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ReadViewDemo/Pods/Pods.xcodeproj/project.pbxproj

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