feat(deps): add spring-cloud-starter-zookeeper-discovery for Dubbo/ZK service discovery

- Add ZK discovery dep to parent POM (v1.1.0.RELEASE, Edgware-compatible)
- Add ZK discovery dep to starter POM for runtime classpath inclusion
- Architecture: discovery.enabled=false → Consul registration only
  ZK DiscoveryClient → service lookup for Feign → Ribbon → ServerList
  Closes gap between architecture design doc and implementation


Former-commit-id: 6b5898d0e07ca6ebf2ccbb69ace5fa77ac6f0749

maven-cw-elevator-application/cw-elevator-application-starter/pom.xml

@@ -52,6 +52,10 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
+        </dependency>
     </dependencies>
 
     <build>