feat(rocketmq): replace Java agent with native Go implementation

crates/dbx-core/src/mq/README.md

@@ -14,7 +14,9 @@ mq/
 ├── service.rs          - 服务层函数
 └── adapters/
     ├── pulsar.rs       - Pulsar 实现
+    ├── kafka.rs        - Kafka 实现 (Java agent)
     ├── rabbitmq.rs     - RabbitMQ 实现 (Go native agent)
+    ├── rocketmq.rs     - RocketMQ 实现 (Go native agent)
     └── pulsar_version.rs - 版本探测
 ```
 

crates/dbx-core/src/mq/adapters/rocketmq.rs

@@ -1,10 +1,9 @@
-//! Apache RocketMQ admin adapter. Communicates with a Java agent process
-//! (`RocketMqAgent.java`) via JSON-RPC over stdin/stdout. The Java agent uses
-//! `DefaultMQAdminExt` for admin operations and `DefaultMQProducer` for
-//! message production.
+//! Apache RocketMQ admin adapter. Communicates with the Go native agent via
+//! JSON-RPC over stdin/stdout. The agent uses `rocketmq-admin-go` plus direct
+//! remoting calls for compatibility gaps in the upstream admin API.
 //!
-//! This adapter follows the same pattern as the ZooKeeper/Etcd agents:
-//! 1. Spawn a Java agent process via `AgentDriverClient`
+//! This adapter follows the same process-agent pattern as the other drivers:
+//! 1. Spawn the native agent process via `AgentDriverClient`
 //! 2. Perform JSON-RPC handshake + connect
 //! 3. Delegate all `MessageQueueAdmin` trait methods to JSON-RPC calls
 
@@ -97,10 +96,10 @@ fn cluster_info_from_agent_result(result: &serde_json::Value) -> MqClusterInfo {
 }
 
 impl RocketMqAdmin {
-    /// Spawn the RocketMQ Java agent, perform handshake, and connect.
+    /// Spawn the RocketMQ native agent, perform handshake, and connect.
     ///
     /// Callers must probe NameServer reachability before invoking this so the
-    /// connect-timeout wall covers only JVM spawn + handshake + connect.
+    /// connect-timeout wall covers only process spawn + handshake + connect.
     pub async fn new(cfg: MqAdminConfig, launch: AgentLaunchSpec) -> Result<Self, String> {
         let mut client = AgentDriverClient::spawn(launch).await?;
 
@@ -814,7 +813,7 @@ fn rocketmq_topic_admin_params(topic: &TopicRef, partitions: Option<u32>) -> ser
     params
 }
 
-/// Build the connection params JSON from MqAdminConfig for the Java agent.
+/// Build the connection params JSON from MqAdminConfig for the native agent.
 fn build_connection_params(cfg: &MqAdminConfig) -> serde_json::Value {
     let extra = &cfg.extra;
     let access_key = extra_str(extra, "accessKey")