完整性更新

现在已经实现了大部分基础功能

drizzle/0004_add_chapter_content_and_kp_chapter.sql

@@ -0,0 +1,3 @@
+ALTER TABLE `chapters` ADD `content` text;--> statement-breakpoint
+ALTER TABLE `knowledge_points` ADD `chapter_id` varchar(128);--> statement-breakpoint
+CREATE INDEX `kp_chapter_id_idx` ON `knowledge_points` (`chapter_id`);