docs(cpp11/02): add final and override chapter (zh + en)#45
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Adds the missing tutorial doc for chapter 02 in both languages, mirroring the structure of existing chapters (00, 11): resource table, Why / Difference Q&A, "I. Basic Usage", "II. Important Notes", "III. Practice Code", "IV. Additional Resources" footer. Covers override for explicit overriding, final on virtual functions and on classes, the final + pure virtual NVI pattern (matching the AudioPlayer/WAV/MP3/OGG exercise), and context-sensitive identifier semantics. SUMMARY.md updated in both zh and en to insert the new entry between 01 and 09.
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Summary
补齐 cpp11 第 2 章 `final 和 override` 的中英文文档（之前两边都缺）。
风格 / 结构对齐已有章节（参照 ch00 auto-and-decltype 和 ch11 inherited-constructors）：
内容覆盖：override 显式重写 + 编译期校验、final 修饰虚函数和类的两种用法、final + 纯虚的 NVI 模板方法（直接对应 02-2 的 AudioPlayer/WAV/MP3/OGG 练习）、上下文相关标识符（解释为什么 dslings 里能用 `B override;` / `B final;` 当变量名）、override 必须配合 virtual、final 类慎用、final 不能用在非虚函数、override + final 可叠加。
视频单元格留空 (`视频解读` / `Video Explanation`)，沿用 12-nullptr / 13-long-long 的"暂未录制"约定。
Test plan