Sync LMS backend source

prisma/migrations/20260707090000_add_curriculum_learning_steps/migration.sql

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+ALTER TABLE "instructor_curriculum_week_overrides"
+  ADD COLUMN IF NOT EXISTS "learning_steps" JSONB;
+
+COMMENT ON COLUMN "instructor_curriculum_week_overrides"."learning_steps" IS '학습단계별 제목, 설명, 동영상, 핵심개념을 묶은 JSON 목록.';