fix(ci): commit version bump back to git after publish

The Jenkinsfile bumped PUBLISH_VERSION during the run but never
committed the change, causing every run to start from the same
base version. Now commits gradle.properties back to main after
successful Nexus publish.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Jenkinsfile

@@ -75,6 +75,7 @@ pipeline {
                     }
                     def newVer = parts.join('.')
                     echo "Auto-bumped PUBLISH_VERSION: ${currentVer} → ${newVer}"
+                    env.NEW_VERSION = newVer
 
                     bat "powershell -Command \"(Get-Content gradle.properties) -replace '^PUBLISH_VERSION=.*', 'PUBLISH_VERSION=${newVer}' | Set-Content gradle.properties\""
 
@@ -112,6 +113,22 @@ pipeline {
                 }
             }
         }
+
+        stage('Commit Version Bump') {
+            steps {
+                withCredentials([usernamePassword(credentialsId: 'gitlab-credentials', passwordVariable: 'GIT_PASS', usernameVariable: 'GIT_USER')]) {
+                    script {
+                        bat """
+                            git config user.email "jenkins@xuqm.com"
+                            git config user.name "Jenkins CI"
+                            git add gradle.properties
+                            git diff --cached --quiet || git commit -m "ci: bump PUBLISH_VERSION to ${env.NEW_VERSION}"
+                            git push https://%GIT_USER%:%GIT_PASS%@xuqinmin.com/xuqmGroup/XuqmGroup-AndroidSDK.git HEAD:main
+                        """
+                    }
+                }
+            }
+        }
     }
 
     post {