Initial commit: AI platform app (server, views, lib, data, deploy docs)

Made-with: Cursor

db/migrations/add-lecture-type-video.sql

@@ -0,0 +1,3 @@
+-- 기존 DB에 학습센터 강의 타입 'video' 추가 (PostgreSQL)
+ALTER TABLE lectures DROP CONSTRAINT IF EXISTS lectures_type_check;
+ALTER TABLE lectures ADD CONSTRAINT lectures_type_check CHECK (type IN ('youtube', 'ppt', 'news', 'link', 'video'));