fix(Harness Sandbox mode)沙箱模式多线程安全问题，以及doflush时，沙箱已经关闭的bug修复

[zhaojinyu]

…reading issues.The sandbox will be released before MemoryFlushMiddleWare executed.

AgentScope-Java Version

2.0.0-RC3

Description

Sandbox模式bug很多，HarnessAgent设计是可复用，在sandbox模式同时访问agent的时候，SandboxLifecycleMiddleware内部的sanbox对象没有线程安全保护，sandbox需要放入context中获取。
另外MemoryFlushMiddleware在执行doFlush的时候，因为是异步的,HarnessAgent在releaseForCall的时候可能已经停掉了sandbox, 异步的doflush已经进不去沙箱获取和上传文件了。sandbox模式比较特殊，其他模式应该没问题，主流程在HarnessAgent里编排的，要改动挺大（担心影响后面的统一设计），先临时把sandbox模式的doflush做成了同步执行，其他的继续走异步。坐等官方统一解决吧。另外还有state返序列化失败，数据库存不进去数等等问题（本pr没修）

Checklist

Please check the following items before code is ready to be reviewed.

• Code has been formatted with mvn spotless:apply
• All tests are passing (mvn test)
• Javadoc comments are complete and follow project conventions
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

[CLAassistant]

All committers have signed the CLA.

[AgentScopeJavaBot]

🤖 AI Review

[chickenlj]

Please fix the test failures, thanks.

Error: Errors:
Error: HarnessAgentTest.runtimeContextSandboxSpecProvidesDefaultSandboxContext:387 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context
Error: SandboxFilesystemIsolationScopeExampleTest.agentScope_allCallsShareOneSandbox:247 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context
Error: SandboxFilesystemIsolationScopeExampleTest.sessionScope_differentSession_createsFreshSandbox:150 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context
Error: SandboxFilesystemIsolationScopeExampleTest.sessionScope_sameSession_resumesSandbox:121 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context
Error: SandboxFilesystemIsolationScopeExampleTest.userScope_differentUsers_createsFreshSandbox:213 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context
Error: SandboxFilesystemIsolationScopeExampleTest.userScope_sameUser_differentSessions_resumesSandbox:184 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context

[zhaojinyu]

Please fix the test failures, thanks.

Error: Errors: Error: HarnessAgentTest.runtimeContextSandboxSpecProvidesDefaultSandboxContext:387 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context Error: SandboxFilesystemIsolationScopeExampleTest.agentScope_allCallsShareOneSandbox:247 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context Error: SandboxFilesystemIsolationScopeExampleTest.sessionScope_differentSession_createsFreshSandbox:150 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context Error: SandboxFilesystemIsolationScopeExampleTest.sessionScope_sameSession_resumesSandbox:121 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context Error: SandboxFilesystemIsolationScopeExampleTest.userScope_differentUsers_createsFreshSandbox:213 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context Error: SandboxFilesystemIsolationScopeExampleTest.userScope_sameUser_differentSessions_resumesSandbox:184 » SandboxConfiguration No active sandbox — sandbox filesystem used outside of a call context

Fix：
In HarnessAgent.Builder, when wiring the default WorkspaceMessageBus / WorkspaceAsyncToolRegistry, route their I/O through a host-side LocalFilesystem rooted at the resolved
workspace if the agent's filesystem is a SandboxBackedFilesystem; otherwise reuse the agent filesystem as before. Other AbstractSandboxFilesystem impls (OverlayFilesystem,
LocalFilesystemWithShell) are unaffected.
本次修改与昨天提交的messageBus的逻辑冲突，在sandbox模式下messagebus依赖SandboxBackedFilesystem，sandbox又在context里，所以执行bus的时候就找不到sandbox就崩了。我理解sandbox模式的bus功能是不是可以使用localfilesystem,感觉本身用SandboxBackedFilesystem管理bus的数据也不太合适？
DistributedStore已经增加了MessageBus的注入，可以增加一个redis版本的实现为sandbox使用

[codecov]

Codecov Report

❌ Patch coverage is 65.00000% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...nt/filesystem/sandbox/SandboxBackedFilesystem.java	25.00%	2 Missing and 1 partial ⚠️
...java/io/agentscope/harness/agent/HarnessAgent.java	71.42%	0 Missing and 2 partials ⚠️
...s/agent/middleware/SandboxLifecycleMiddleware.java	77.77%	1 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!

[zhaojinyu]

@chickenlj please review. thanks