Create 3 simple cross-platform run configurations

1. Pet Shop Application - Run Spring Boot (main run config)
2. Database - Start database containers
3. Reset Database - Clean volumes and restart (Maven-based, auto-stops)

All use IntelliJ Docker/Spring Boot/Maven integration (Windows/Mac/Linux).
Reset Database uses exec-maven-plugin to run docker compose down -v.
Stops automatically when complete.

pom.xml

@@ -102,6 +102,29 @@
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>3.1.0</version>
+                <executions>
+                    <execution>
+                        <id>docker-down</id>
+                        <goals>
+                            <goal>exec</goal>
+                        </goals>
+                        <configuration>
+                            <executable>docker</executable>
+                            <arguments>
+                                <argument>compose</argument>
+                                <argument>-f</argument>
+                                <argument>docker-compose.dev.yml</argument>
+                                <argument>down</argument>
+                                <argument>-v</argument>
+                            </arguments>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 </project>

src/test/java/com/petshop/backend/config/RunConfigValidationTest.java

@@ -53,14 +53,14 @@ class RunConfigValidationTest {
 
         // Expected module name in run configs should match artifactId
         assertEquals("backend", artifactId,
-            "pom.xml artifactId has changed. Update .idea/runConfigurations/PetshopBackendApplication.xml module name to match.");
+            "pom.xml artifactId has changed. Update run configuration files if needed.");
     }
 
     @Test
     void runConfigurationFileExists() {
-        File runConfigFile = new File(".idea/runConfigurations/PetshopBackendApplication.xml");
+        File runConfigFile = new File(".idea/runConfigurations/Pet_Shop_Application.xml");
         assertTrue(runConfigFile.exists(),
-            "Run configuration file missing. Ensure .idea/runConfigurations/ directory is committed to Git.");
+            "Main run configuration file missing. Ensure .idea/runConfigurations/ directory is committed to Git.");
     }
 
     @Test