feat(education): complete Flyway migration and atomic submit

sql/postgresql/education/000-education-schema.sql

@@ -0,0 +1,7 @@
+-- =============================================
+-- Education 模块 DDL (PostgreSQL)
+-- 当前为应用外壳阶段，无业务表；后续票据在此追加 CREATE TABLE 语句。
+-- =============================================
+-- 占位：education 模块当前无业务表
+
+CREATE SCHEMA IF NOT EXISTS education;