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docs/course-defense.md

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+# ChuSQL 技术总结与数据库课程答辩
+
+完整学习与答辩材料已集中到仓库根目录的 `learnning/`：
+
+- [分章节学习目录](../learnning/README.md)
+- [答辩总览](../learnning/00-defense-overview.md)
+- [关键函数导航](../learnning/17-function-atlas.md)
+- [现场演示与排练](../learnning/14-demonstration.md)