Add spring backend

backend-spring/build.gradle.kts

@@ -0,0 +1,37 @@
+plugins {
+    java
+    id("org.springframework.boot") version "4.0.3"
+    id("io.spring.dependency-management") version "1.1.7"
+}
+
+group = "be.seeseepuff"
+version = "0.0.1-SNAPSHOT"
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(25)
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+    implementation("org.springframework.boot:spring-boot-starter-thymeleaf")
+    implementation("org.springframework.boot:spring-boot-starter-flyway")
+    implementation("org.flywaydb:flyway-database-postgresql")
+    runtimeOnly("org.postgresql:postgresql")
+
+    testImplementation("org.springframework.boot:spring-boot-starter-test")
+    testImplementation("org.springframework.boot:spring-boot-testcontainers")
+    testImplementation("org.testcontainers:testcontainers-junit-jupiter:2.0.3")
+    testImplementation("org.testcontainers:testcontainers-postgresql:2.0.3")
+    testImplementation("io.rest-assured:rest-assured:6.0.0")
+}
+
+tasks.withType<Test> {
+    useJUnitPlatform()
+}