feat: Add RequestUrlUtils for building base URLs and refactor OutdoorFairController to use it

ruoyi-bussiness/pom.xml

@@ -116,6 +116,11 @@
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jsr310</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
-</project>
+</project>