Initialize RTGS prototype repository

3센터 A-A-A RTGS 실시간총액결제 프로토타입 최초 버전관리 시작.
- backend: Kotlin/Gradle 멀티모듈(sequencer, common, 채널/센터 모듈)
- frontend: Vite + TS
- infra: docker-compose, prometheus/grafana, ELK 네이티브 스크립트
- loadtest(k6), sim(장애/순서/정합성 시나리오), docs(PoC 보고서/복원력방안)

backend/hermes/build.gradle.kts

@@ -0,0 +1,20 @@
+plugins {
+    kotlin("jvm")
+    kotlin("plugin.spring")
+    id("org.springframework.boot")
+    id("io.spring.dependency-management")
+}
+
+dependencies {
+    implementation(project(":common"))
+    implementation("org.springframework.boot:spring-boot-starter")
+    implementation("org.springframework.boot:spring-boot-starter-actuator")
+    implementation("org.springframework.boot:spring-boot-starter-web") // 메트릭/헬스 노출(B4)
+    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+    implementation("org.springframework.kafka:spring-kafka")
+    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
+    implementation("org.jetbrains.kotlin:kotlin-reflect")
+    runtimeOnly("org.postgresql:postgresql")
+    testImplementation("org.springframework.boot:spring-boot-starter-test")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}