ci: auto semver versioning, remove manual params, add demo-service

- Remove VERSION_STRATEGY/CUSTOM_VERSION/CHANGELOG/DEPLOY params
- Auto patch-bump from VERSION file (reset to 1.0.0 semver)
- Push :VERSION + :latest tags per service for one-click update
- Add demo-service to build choices
- Always deploy; merge-update versions.json (no web entry overwrite)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Jenkinsfile

@@ -4,8 +4,8 @@ pipeline {
   parameters {
     choice(
       name: 'SERVICE',
-      choices: ['all', 'tenant-service', 'im-service', 'push-service', 'update-service', 'file-service', 'license-service'],
-      description: '要构建的服务模块（all = 全部）'
+      choices: ['all', 'tenant-service', 'im-service', 'push-service', 'update-service', 'file-service', 'license-service', 'demo-service'],
+      description: '要构建的服务模块（all = 全部，包含所有微服务）'
     )
   }
 
@@ -58,7 +58,7 @@ pipeline {
         withCredentials([string(credentialsId: 'ACR_PASSWORD', variable: 'ACR_PASS')]) {
           script {
             def services = params.SERVICE == 'all'
-              ? ['tenant-service', 'im-service', 'push-service', 'update-service', 'file-service', 'license-service']
+              ? ['tenant-service', 'im-service', 'push-service', 'update-service', 'file-service', 'license-service', 'demo-service']
               : [params.SERVICE]
 
             for (svc in services) {
@@ -91,7 +91,7 @@ pipeline {
           withCredentials([sshUserPrivateKey(credentialsId: 'PROD_SSH_KEY', keyFileVariable: 'SSH_KEY')]) {
             script {
               def services = params.SERVICE == 'all'
-                ? ['tenant-service', 'im-service', 'push-service', 'update-service', 'file-service', 'license-service']
+                ? ['tenant-service', 'im-service', 'push-service', 'update-service', 'file-service', 'license-service', 'demo-service']
                 : [params.SERVICE]
 
               for (svc in services) {
@@ -106,7 +106,7 @@ pipeline {
 
               // Update versions.json on server for deployed services
               def deployedServices = params.SERVICE == 'all'
-                ? ['tenant-service', 'im-service', 'push-service', 'update-service', 'file-service', 'license-service']
+                ? ['tenant-service', 'im-service', 'push-service', 'update-service', 'file-service', 'license-service', 'demo-service']
                 : [params.SERVICE]
               def releasedAt = new Date().format("yyyy-MM-dd'T'HH:mm:ss'Z'", TimeZone.getTimeZone('UTC'))
               def serviceEntries = deployedServices.collect { svc ->