refactor: enforce kafka mq sink type

modules/sinks/sink-mq/src/main/java/com/lingniu/ingest/sink/mq/SinkMqAutoConfiguration.java

@@ -23,8 +23,7 @@ import java.util.Properties;
  *   <li>{@code lingniu.ingest.sink.mq.enabled=true}（默认 true）—— <b>总开关</b>，
  *       设为 false 时本模块完全不装配，ingest-core 的 DisruptorEventBus 仍然运行但
  *       没有 Kafka sink。
- *   <li>{@code lingniu.ingest.sink.mq.type=kafka}（默认 kafka）—— 后端选择，预留
- *       rocketmq/pulsar 等扩展。
+ *   <li>{@code lingniu.ingest.sink.mq.type=kafka}（默认 kafka）—— 唯一生产 MQ 后端。
  * </ol>
  *
  * <p>Producer 和 Consumer 是两个独立开关：{@code sink.mq.enabled=true} 只表示可以创建

modules/sinks/sink-mq/src/main/java/com/lingniu/ingest/sink/mq/SinkMqProperties.java

@@ -5,6 +5,7 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
 import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 
 @ConfigurationProperties(prefix = "lingniu.ingest.sink.mq")
@@ -18,7 +19,7 @@ public class SinkMqProperties {
      */
     private boolean enabled = true;
 
-    /** MQ 后端类型。目前仅支持 kafka，预留 rocketmq/pulsar 等。 */
+    /** MQ 后端类型。生产链路只允许 kafka。 */
     private String type = "kafka";
     /** Kafka bootstrap servers；生产环境应通过环境变量覆盖，不建议使用默认开发地址。 */
     private String bootstrapServers = "114.55.58.251:9092";
@@ -35,7 +36,13 @@ public class SinkMqProperties {
     public boolean isEnabled() { return enabled; }
     public void setEnabled(boolean enabled) { this.enabled = enabled; }
     public String getType() { return type; }
-    public void setType(String type) { this.type = type; }
+    public void setType(String type) {
+        String value = type == null || type.isBlank() ? "kafka" : type.trim().toLowerCase(Locale.ROOT);
+        if (!"kafka".equals(value)) {
+            throw new IllegalStateException("sink.mq.type supports only kafka; configured value: " + type);
+        }
+        this.type = value;
+    }
     public String getBootstrapServers() { return bootstrapServers; }
     public void setBootstrapServers(String bootstrapServers) { this.bootstrapServers = bootstrapServers; }
     public String getCompressionType() { return compressionType; }

modules/sinks/sink-mq/src/test/java/com/lingniu/ingest/sink/mq/SinkMqPropertiesTest.java

@@ -3,6 +3,7 @@ package com.lingniu.ingest.sink.mq;
 import org.junit.jupiter.api.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 class SinkMqPropertiesTest {
 
@@ -15,4 +16,14 @@ class SinkMqPropertiesTest {
         props.setBootstrapServers("kafka.internal:9092");
         assertThat(props.getBootstrapServers()).isEqualTo("kafka.internal:9092");
     }
+
+    @Test
+    void rejectsUnsupportedMqTypeInsteadOfSilentlyDisablingKafkaBeans() {
+        SinkMqProperties props = new SinkMqProperties();
+
+        assertThatThrownBy(() -> props.setType("rocketmq"))
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("sink.mq.type supports only kafka")
+                .hasMessageContaining("rocketmq");
+    }
 }