[Bug]:单例并发问题，目前多用户同时问，总会出现等待

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**Describe the bug**
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**To Reproduce**
Steps to reproduce the behavior:

1. You code
2. How to execute
3. See error

**Expected behavior**
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**Error messages**
Detailed error messages.

**Environment (please complete the following information):**

- AgentScope-Java Version: [e.g. 1.0.12, check your pom.xml dependency version or run `mvn dependency:tree | grep agentscope-parent:pom`(only mac/linux)]
- Java Version: [e.g. 17]
- OS: [e.g. macos, windows]

**Additional context**
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