feat(databus): 完成阶段四-DataBus Server完整功能

- 补充缺失的 API 类（DatabusMessage、DatabusBatchMessage、DatabusEventType）
- 新增变更消息消费者（3个：部门、用户、岗位）
- 新增数据提供者（3个：部门、用户、岗位）
- 确认分发器服务（核心定向推送逻辑）
- 确认全量同步与消息推送组件
- 确认管理后台 API（5个 Controller）
- 确认 Service ��（4个核心服务）
- 确认 DAL 层（7个 DO + Mapper）
- 添加 databus-server starter 依赖到 pom.xml
- 编译验证通过

Ref: docs/databus/implementation-checklist.md 任务 39-70

zt-framework/zt-spring-boot-starter-databus-server/pom.xml

@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <groupId>com.zt.plat</groupId>
+        <artifactId>zt-framework</artifactId>
+        <version>${revision}</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>zt-spring-boot-starter-databus-server</artifactId>
+    <packaging>jar</packaging>
+
+    <name>${project.artifactId}</name>
+    <description>DataBus 服务端组件，负责发送数据变更消息到各客户端</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.zt.plat</groupId>
+            <artifactId>zt-common</artifactId>
+        </dependency>
+
+        <!-- Databus API -->
+        <dependency>
+            <groupId>com.zt.plat</groupId>
+            <artifactId>zt-module-databus-api</artifactId>
+            <version>${revision}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-all</artifactId>
+        </dependency>
+
+        <!-- MQ -->
+        <dependency>
+            <groupId>com.zt.plat</groupId>
+            <artifactId>zt-spring-boot-starter-mq</artifactId>
+        </dependency>
+
+        <!-- MyBatis -->
+        <dependency>
+            <groupId>com.zt.plat</groupId>
+            <artifactId>zt-spring-boot-starter-mybatis</artifactId>
+        </dependency>
+
+        <!-- Web -->
+        <dependency>
+            <groupId>com.zt.plat</groupId>
+            <artifactId>zt-spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <!-- Security -->
+        <dependency>
+            <groupId>com.zt.plat</groupId>
+            <artifactId>zt-spring-boot-starter-security</artifactId>
+        </dependency>
+
+        <!-- Tenant -->
+        <dependency>
+            <groupId>com.zt.plat</groupId>
+            <artifactId>zt-spring-boot-starter-biz-tenant</artifactId>
+        </dependency>
+
+        <!-- Test -->
+        <dependency>
+            <groupId>com.zt.plat</groupId>
+            <artifactId>zt-spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>