fix(ci): 服务端流水线注入加固(tag 校验/JSON 转义/workflow env)+ gitignore server/out

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013nMthbVEmQquxBRKb9Fj8u

.gitignore

@@ -48,6 +48,7 @@ app/kernel/.build/
 # Go 编译产物（mock server 等）
 server/mockserver
 server/pangolin-server
+server/out/
 
 # Flutter / Dart 构建产物与本地配置
 client/android/local.properties