feat: add Spring Boot ERP application with user management domain

Implement DDD-based architecture with domain, application, infrastructure,
and API layers. Includes user/role management with authentication,
RBAC permissions, audit logging, Liquibase migrations, and test suite.

src/test/resources/application-test.yml

@@ -0,0 +1,25 @@
+spring:
+  datasource:
+    url: jdbc:h2:mem:testdb
+    driver-class-name: org.h2.Driver
+    username: sa
+    password:
+
+  jpa:
+    database-platform: org.hibernate.dialect.H2Dialect
+    hibernate:
+      ddl-auto: create-drop
+    show-sql: true
+
+  liquibase:
+    enabled: false  # Use Hibernate for test schema
+
+jwt:
+  secret: TestSecretKeyForUnitTestsMin256BitsLongForHS256AlgorithmSecurity
+  expiration: 3600000  # 1 hour for tests
+  refresh-expiration: 7200000  # 2 hours for tests
+
+logging:
+  level:
+    root: INFO
+    de.effigenix: DEBUG