Initial commit: WBX Spring Framework Core

Spring Boot 3.5.0 + Java 21 기반 엔터프라이즈 프레임워크
- Auth: JWT, MFA/TOTP, OAuth2 SSO, PasswordPolicy, LoginHistory
- RBAC: Role-Permission, DeptScope, Redis 캐시
- Approval: Handler 패턴 결재 엔진
- Notification: SSE 실시간 알림
- File: Local/Azure Blob/AWS S3/GCP Storage
- DataSource: Multi-DB 라우팅 (MySQL/PG/Oracle/MSSQL)
- Admin: Thymeleaf 11화면 콘솔
- Compat: WBX FastAPI 호환 (에러/페이징)
- Flyway: 4종 DBMS 마이그레이션
- Scripts: install.bat/sh, deploy-prod.sh
- Docs: 설치가이드(OnPremise/Cloud), 개발자가이드 PDF

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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