fix: promote lettuce-core from compileOnly to implementation (#223)

## Summary

Follow-up to #222. `compileOnly` fixed the Java 25 javac type-annotation
error but left `lettuce-core` off the runtime classpath —
`spring-data-redis` declares it `optional` in its Maven POM, so Gradle
omits it entirely without an explicit dep. Spring Session Redis would
throw `NoClassDefFoundError` at runtime when a Redis session store is
configured.

Changing to `implementation` puts it on both the compile and runtime
classpath.

Author: coopernetes

git-proxy-java-dashboard/build.gradle

@@ -170,7 +170,7 @@ dependencies {
     // MongoDB driver — compile-scoped because MongoSessionRepository uses the sync client directly.
     implementation "org.mongodb:mongodb-driver-sync:${mongoVersion}"
 
-    compileOnly "io.lettuce:lettuce-core:${lettuceVersion}"
+    implementation "io.lettuce:lettuce-core:${lettuceVersion}"
 
     // OpenAPI spec generation — core model + YAML/JSON serialisation only (no JAX-RS required).
     // The spec is built programmatically from Spring's RequestMappingHandlerMapping.

git-proxy-java-dashboard/src/test/java/org/finos/gitproxy/dashboard/session/RedisSessionRepositoryIntegrationTest.java

@@ -0,0 +1,86 @@
+package org.finos.gitproxy.dashboard.session;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.time.Duration;
+import org.junit.jupiter.api.*;
+import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
+import org.springframework.data.redis.connection.lettuce.LettuceClientConfiguration;
+import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.serializer.RedisSerializer;
+import org.springframework.session.data.redis.RedisIndexedSessionRepository;
+import org.testcontainers.containers.GenericContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
+
+@Testcontainers
+@Tag("integration")
+class RedisSessionRepositoryIntegrationTest {
+
+    @SuppressWarnings("resource")
+    @Container
+    static final GenericContainer<?> VALKEY =
+            new GenericContainer<>(DockerImageName.parse("docker.io/valkey/valkey:8")).withExposedPorts(6379);
+
+    private LettuceConnectionFactory factory;
+    private RedisIndexedSessionRepository repo;
+
+    @BeforeEach
+    void setUp() {
+        var standalone = new RedisStandaloneConfiguration(VALKEY.getHost(), VALKEY.getMappedPort(6379));
+        factory = new LettuceConnectionFactory(standalone, LettuceClientConfiguration.defaultConfiguration());
+        factory.afterPropertiesSet();
+
+        var template = new RedisTemplate<String, Object>();
+        template.setConnectionFactory(factory);
+        template.setKeySerializer(RedisSerializer.string());
+        template.setHashKeySerializer(RedisSerializer.string());
+        template.afterPropertiesSet();
+
+        repo = new RedisIndexedSessionRepository(template);
+        repo.setDefaultMaxInactiveInterval(Duration.ofMinutes(30));
+    }
+
+    @AfterEach
+    void tearDown() {
+        factory.destroy();
+    }
+
+    @Test
+    void createSession_hasConfiguredTimeout() {
+        var s = repo.createSession();
+        assertEquals(Duration.ofMinutes(30), s.getMaxInactiveInterval());
+    }
+
+    @Test
+    void save_then_findById_roundTripsAttributes() {
+        var s = repo.createSession();
+        s.setAttribute("username", "alice");
+        s.setAttribute("role-count", 3);
+        repo.save(s);
+
+        var loaded = repo.findById(s.getId());
+        assertNotNull(loaded);
+        assertEquals(s.getId(), loaded.getId());
+        assertEquals("alice", loaded.getAttribute("username"));
+        assertEquals(Integer.valueOf(3), loaded.getAttribute("role-count"));
+    }
+
+    @Test
+    void findById_unknownId_returnsNull() {
+        assertNull(repo.findById("does-not-exist"));
+    }
+
+    @Test
+    void deleteById_removesSession() {
+        var s = repo.createSession();
+        s.setAttribute("k", "v");
+        repo.save(s);
+        assertNotNull(repo.findById(s.getId()));
+
+        repo.deleteById(s.getId());
+        assertNull(repo.findById(s.getId()));
+    }
+}