fix(sandbox): add optional configurations for OSS, NAS, and PolarFS

[Sodawyx]

Fix issue #54

• Introduced optional parameters for OSSMountConfig, NASConfig, and PolarFsConfig in SandboxToolSet and its subclasses.
• Updated sandbox_toolset function to accept new configuration options.
• Adjusted imports in sandbox module to include PolarFsMountConfig.

This enhancement allows for more flexible sandbox configurations, improving integration capabilities.

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[Copilot]

Pull request overview

This PR addresses issue #54 by exposing sandbox mount configuration options (OSS/NAS/PolarFS) through the higher-level SandboxToolSet API, so callers can pass these settings without monkey-patching lower layers.

Changes:

• Added optional oss_mount_config, nas_config, and polar_fs_config parameters to SandboxToolSet and propagated them into Sandbox.create().
• Threaded the same optional configs through CodeInterpreterToolSet, BrowserToolSet, and the sandbox_toolset() factory.
• Exported PolarFsMountConfig from agentrun.sandbox for easier imports.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
agentrun/sandbox/init.py	Re-exports PolarFsMountConfig via module imports and __all__.
agentrun/integration/builtin/sandbox.py	Adds optional mount configs to ToolSet constructors and forwards them into sandbox creation + toolset factory.

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