fix(gb32960): emit platform login/logout events instead of swallowing them

Gb32960RealtimeHandler.onPlatform 之前返回 List.of() 吞掉所有 0x05/0x06 事件，
而 Gb32960EventMapper.toEvents 里 PLATFORM_LOGIN / PLATFORM_LOGOUT 分支实际构造了
VehicleEvent.Login/Logout（vin="platform:<username>"，metadata.kind="platform"）。
两边语义冲突导致平台登入事件永远不会上送下游——mapper 里那段是死代码。

修正：
- onPlatform 改为委托 mapper.toEvents(msg)，让平台会话事件真正发布到
  vehicle.session topic，下游按 metadata.kind 区分车辆/平台会话
- 加 @EventEmit 声明 Login/Logout 事件类，保持元数据一致
- 去掉 @ProtocolHandler(version = "2017")：2017 不是真实的 GB/T 32960 版本（标准
  仅 2016 / 2025），且 version 属性在 HandlerRegistry 路由里未使用，纯噪音
- JavaDoc 从"示例 Handler：演示..."改为生产路径描述，说明它是 GB32960 在
  Dispatcher 管线里的唯一入口

新增 Gb32960RealtimeHandlerTest 2 case 覆盖平台登入/登出事件产出。
全模块 41 tests 全绿（原 39 + 新 2），无回归。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

protocol-gb32960/src/main/java/com/lingniu/ingest/protocol/gb32960/handler/Gb32960RealtimeHandler.java

@@ -7,18 +7,19 @@ import com.lingniu.ingest.api.annotation.ProtocolHandler;
 import com.lingniu.ingest.api.annotation.RateLimited;
 import com.lingniu.ingest.api.event.VehicleEvent;
 import com.lingniu.ingest.protocol.gb32960.mapper.Gb32960EventMapper;
-import com.lingniu.ingest.protocol.gb32960.model.CommandType;
 import com.lingniu.ingest.protocol.gb32960.model.Gb32960Message;
 
 import java.util.List;
 
 /**
- * 示例 Handler：演示注解驱动的消息路由与事件产出。
+ * GB/T 32960 协议 Handler：Dispatcher 路由到此的所有 0x01~0x07 命令都委托给
+ * {@link Gb32960EventMapper} 转成 {@link VehicleEvent}。
  *
- * <p>构造器注入 {@link Gb32960EventMapper}，全部业务逻辑限制在纯函数里，不触碰数据库 / 不做 IO。
- * 产出的事件由 Dispatcher 统一投递到 Disruptor → Kafka。
+ * <p>这是 GB32960 协议在通用 Dispatcher 管线里的**唯一入口** Bean——移除将导致所有
+ * GB32960 帧产出的事件丢失。构造器注入 {@link Gb32960EventMapper}，全部业务逻辑限制
+ * 在纯函数里，不触碰数据库 / 不做 IO。产出的事件由 Dispatcher 统一投递到 Disruptor → Kafka。
  */
-@ProtocolHandler(protocol = ProtocolId.GB32960, version = "2017")
+@ProtocolHandler(protocol = ProtocolId.GB32960)
 public class Gb32960RealtimeHandler {
 
     private final Gb32960EventMapper mapper;
@@ -42,11 +43,15 @@ public class Gb32960RealtimeHandler {
         return mapper.toEvents(msg);
     }
 
-    /** 平台登入 / 登出：仅用于 OEM 平台间握手，不产出业务事件。 */
+    /**
+     * 平台登入 / 登出（0x05 / 0x06）：外部下级平台握手，产出
+     * {@link VehicleEvent.Login} / {@link VehicleEvent.Logout}，
+     * vin 字段形如 {@code platform:<username>}，metadata 带 {@code kind=platform}，
+     * 下游消费者可据此区分车辆会话与平台会话。
+     */
     @MessageMapping(command = {0x05, 0x06}, desc = "平台登入/登出")
+    @EventEmit({VehicleEvent.Login.class, VehicleEvent.Logout.class})
     public List<VehicleEvent> onPlatform(Gb32960Message msg) {
-        CommandType cmd = msg.header().command();
-        // 留个 hook：后续可在此触发 session-core 的平台会话事件
-        return List.of();
+        return mapper.toEvents(msg);
     }
 }

protocol-gb32960/src/test/java/com/lingniu/ingest/protocol/gb32960/handler/Gb32960RealtimeHandlerTest.java

@@ -0,0 +1,79 @@
+package com.lingniu.ingest.protocol.gb32960.handler;
+
+import com.lingniu.ingest.api.event.VehicleEvent;
+import com.lingniu.ingest.protocol.gb32960.mapper.Gb32960EventMapper;
+import com.lingniu.ingest.protocol.gb32960.model.CommandBody;
+import com.lingniu.ingest.protocol.gb32960.model.CommandType;
+import com.lingniu.ingest.protocol.gb32960.model.EncryptType;
+import com.lingniu.ingest.protocol.gb32960.model.Gb32960Header;
+import com.lingniu.ingest.protocol.gb32960.model.Gb32960Message;
+import com.lingniu.ingest.protocol.gb32960.model.ProtocolVersion;
+import com.lingniu.ingest.protocol.gb32960.model.ResponseFlag;
+import org.junit.jupiter.api.Test;
+
+import java.time.Instant;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * 保障 {@link Gb32960RealtimeHandler} 正确委托给 {@link Gb32960EventMapper}，
+ * 不吞掉任何需要上送下游的事件。
+ */
+class Gb32960RealtimeHandlerTest {
+
+    private final Gb32960RealtimeHandler handler = new Gb32960RealtimeHandler(new Gb32960EventMapper());
+
+    @Test
+    void onPlatform_login_emitsLoginEventWithKindPlatform() {
+        Gb32960Message msg = buildPlatformLoginMessage("lingniu");
+
+        List<VehicleEvent> events = handler.onPlatform(msg);
+
+        assertThat(events).hasSize(1);
+        VehicleEvent first = events.get(0);
+        assertThat(first).isInstanceOf(VehicleEvent.Login.class);
+        assertThat(first.vin()).isEqualTo("platform:lingniu");
+        assertThat(first.metadata())
+                .containsEntry("kind", "platform")
+                .containsEntry("username", "lingniu");
+    }
+
+    @Test
+    void onPlatform_logout_emitsLogoutEventWithKindPlatform() {
+        Gb32960Message msg = new Gb32960Message(
+                new Gb32960Header(
+                        ProtocolVersion.V2016,
+                        CommandType.PLATFORM_LOGOUT,
+                        ResponseFlag.COMMAND,
+                        "00000000000000000",
+                        EncryptType.UNENCRYPTED,
+                        0,
+                        null),
+                new CommandBody.PlatformLogout(Instant.parse("2026-04-20T10:00:00Z"), 1));
+
+        List<VehicleEvent> events = handler.onPlatform(msg);
+
+        assertThat(events).hasSize(1);
+        assertThat(events.get(0)).isInstanceOf(VehicleEvent.Logout.class);
+        assertThat(events.get(0).metadata()).containsEntry("kind", "platform");
+    }
+
+    private static Gb32960Message buildPlatformLoginMessage(String username) {
+        return new Gb32960Message(
+                new Gb32960Header(
+                        ProtocolVersion.V2016,
+                        CommandType.PLATFORM_LOGIN,
+                        ResponseFlag.COMMAND,
+                        "00000000000000000",
+                        EncryptType.UNENCRYPTED,
+                        0,
+                        null),
+                new CommandBody.PlatformLogin(
+                        Instant.parse("2026-04-20T10:00:00Z"),
+                        1,
+                        username,
+                        "secret",
+                        EncryptType.UNENCRYPTED));
+    }
+}