chore: Add Gradle run configuration for plugin publishing

- Create .run/PublishPlugin.run.xml to configure Gradle task for publishing the plugin.
- Update gradle.properties to set plugin version to 1.2.0-SNAPSHOT.

.run/PublishPlugin.run.xml

@@ -0,0 +1,24 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="PublishPlugin" type="GradleRunConfiguration" factoryName="Gradle">
+    <ExternalSystemSettings>
+      <option name="executionName" />
+      <option name="externalProjectPath" value="$PROJECT_DIR$" />
+      <option name="externalSystemIdString" value="GRADLE" />
+      <option name="scriptParameters" value="" />
+      <option name="taskDescriptions">
+        <list />
+      </option>
+      <option name="taskNames">
+        <list>
+          <option value="publishPlugin" />
+        </list>
+      </option>
+      <option name="vmOptions" />
+    </ExternalSystemSettings>
+    <ExternalSystemDebugServerProcess>true</ExternalSystemDebugServerProcess>
+    <ExternalSystemReattachDebugProcess>true</ExternalSystemReattachDebugProcess>
+    <DebugAllEnabled>false</DebugAllEnabled>
+    <RunAsTest>false</RunAsTest>
+    <method v="2" />
+  </configuration>
+</component>

gradle.properties

@@ -6,7 +6,7 @@ pluginGroup = com.phodal.shire
 pluginName = Shire - AI Coding Agent Language
 pluginRepositoryUrl = https://github.com/phodal/shire
 # SemVer format -> https://semver.org
-pluginVersion = 1.1.1
+pluginVersion = 1.2.0-SNAPSHOT
 
 # IntelliJ Platform Properties -> https://plugins.jetbrains.com/docs/intellij/tools-gradle-intellij-plugin.html#configuration-intellij-extension
 platformType = IU