Prepend 'http://' to host in ChromaConnectionDetails

Modify getHost method to return a properly formatted URL string. This
ensures that the Chroma client can correctly connect to the service
when using Docker Compose.

Fixes #1395

spring-ai-spring-boot-docker-compose/src/main/java/org/springframework/ai/docker/compose/service/connection/chroma/ChromaDockerComposeConnectionDetailsFactory.java

@@ -60,7 +60,7 @@ class ChromaDockerComposeConnectionDetailsFactory
 
 		@Override
 		public String getHost() {
-			return this.host;
+			return "http://%s".formatted(this.host);
 		}
 
 		@Override