Merge pull request 'docs: 릴리즈 노트 정리 (2026-04-07)' (#1) from chore/release-notes-2026-04-07 into develop

docs/RELEASE-NOTES.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/ko/1.0.0/).
+
+## [Unreleased]
+
+## [2026-04-07]
+
+### 추가
+
+- Spring Boot 3.2.1 백엔드 초기 구조 (com.gcsc.connection, 포트 8042, context /snp-connection)
+- React 19 + TypeScript + Vite 7 + Tailwind CSS 4 프론트엔드 통합
+- frontend-maven-plugin 기반 통합 빌드 설정
+- SPA fallback WebViewController, SecurityConfig, SwaggerConfig
+- 공통 모듈 (ApiResponse, GlobalExceptionHandler)
+- 파비콘 등록 (favicon_io_red)
+- 팀 워크플로우 v1.6.1 동기화