Apache Dubbo RPC call-chain diagram prompt

Create a restrained 16:9 editorial architecture diagram for a Chinese source-code guide about Apache Dubbo. Show a left-to-right request path from a Java consumer interface proxy through a dynamic service directory, router, load balancer, failover cluster, protocol invoker and network exchange to a provider exporter and Java service implementation. Add a thinner return path labeled by request ID and future completion. Show ZooKeeper above the directory as an address and configuration source, clearly outside the business-data path. Use a light neutral background, charcoal structure, restrained green for successful request flow, amber for timeout and retry branches, crisp Chinese labels, square or low-radius nodes, and precise arrows. No gradients, decorative blobs, product screenshots, credentials, benchmark claims or invented infrastructure. Leave modest clear space for the article title. This remains prompt-only until image generation is explicitly requested.