feat(tool/cloud-storage): configure object operation parameters

[huangjiahua]

1. Description

Completes configurable parameter support for the remaining Cloud Storage object tools, using the functional-option parameter constructors introduced in #3314.

This change adds optional config-backed values for download, upload, write, copy, move, and delete object tools. Configured fields are hidden from the runtime manifest while zero-config tools keep their current parameter schemas. Download also supports a configured destination_dir, where the runtime destination remains visible but becomes a relative path constrained under that directory.

2. PR Checklist

• Make sure to open an issue as a bug/issue before writing your code!
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)
• Make sure to add ! if this involves a breaking change

3. Issue Reference

Related to #3314 🦕

[gemini-code-assist]

Code Review

This pull request introduces tool-level configuration options for Google Cloud Storage (GCS) tools, allowing parameters like bucket, source_bucket, destination_bucket, destination_dir, and overwrite to be pre-configured. When configured, these parameters are hidden from the LLM's parameter list. It also adds path resolution safety via ResolveWithinDir to prevent directory traversal attacks during downloads, updates the corresponding documentation pages, and adds comprehensive unit and integration tests. I have no feedback to provide as there are no review comments to evaluate.