init: 클린 아키텍처 백엔드

src/adapter/outbound/persistence-mongo/build.gradle

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+// Driven adapter: NoSQL persistence scaffolding via Spring Data MongoDB. This is a LIGHTWEIGHT,
+// opt-in skeleton — it wires the Mongo driver + a demonstrative document/repository/adapter that
+// shows the document<->domain mapping boundary a fork would follow. It does NOT reimplement
+// idempotency/outbox/lock on Mongo (those stay JPA-only). Mongo auto-configuration is imported and
+// the repositories enabled ONLY when ca-skeleton.persistence-mongo.enabled=true
+// (MongoPersistenceConfig), so the driver never connects when the module is merely on the classpath.
+//
+// spring-boot-starter-data-mongodb's version is managed by the Spring Boot BOM (applied to every
+// module in src/build.gradle), so no module-scoped platform is needed. The Testcontainers MongoDB
+// integration test uses the BOM-managed Testcontainers, and is skipped when Docker is unavailable.
+description = 'Outbound adapter: NoSQL persistence scaffolding (Spring Data MongoDB)'
+
+dependencies {
+    implementation project(':application-core')
+    implementation project(':shared-contract')
+
+    implementation 'org.springframework.boot:spring-boot-starter-data-mongodb'
+
+    annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'
+
+    // test-only: Testcontainers MongoDB integration test for the repository round-trip. Uses the core
+    // GenericContainer (no dedicated module) so the repository save/find runs against a real MongoDB
+    // when Docker is available and is skipped (disabledWithoutDocker) otherwise — mirroring the
+    // object-storage module's MinIO integration test.
+    testImplementation 'org.testcontainers:testcontainers'
+    testImplementation 'org.testcontainers:testcontainers-junit-jupiter'
+}