Initialize backend

backend/build.gradle

@@ -0,0 +1,43 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '4.0.2'
+	id 'io.spring.dependency-management' version '1.1.7'
+}
+
+group = 'net.kpuig.concord'
+version = '0.0.1-SNAPSHOT'
+description = 'Demo project for Spring Boot'
+
+java {
+	toolchain {
+		languageVersion = JavaLanguageVersion.of(25)
+	}
+}
+
+configurations {
+	compileOnly {
+		extendsFrom annotationProcessor
+	}
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+	implementation 'org.springframework.boot:spring-boot-starter-webmvc'
+	implementation 'org.springframework.boot:spring-boot-starter-websocket'
+	compileOnly 'org.projectlombok:lombok'
+	runtimeOnly 'org.postgresql:postgresql'
+	runtimeOnly 'com.h2database:h2:2.4.240'
+	annotationProcessor 'org.projectlombok:lombok'
+	testImplementation 'org.springframework.boot:spring-boot-starter-data-jpa-test'
+	testImplementation 'org.springframework.boot:spring-boot-starter-webmvc-test'
+	testImplementation 'org.springframework.boot:spring-boot-starter-websocket-test'
+	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}