Fix escaping XPath characters & add set_values_by_xpaths

[WASDi]

This fixes XPath expressions like get_value_by_xpath("Device/Hosts/Hosts/Host[@uid=\"8258\"]/UserFriendlyName").

Also added a method set_values_by_xpaths to set multiple values in one call, as was available to get multiple values.

Updated README.md to reflect actual python version needed according to pyproject.toml.

[iMicknl]

Thanks @WASDi! Are you using the library directly or via the Home Assistant by any chance?

A few remarks:

[Copilot]

Pull request overview

This PR improves XPath handling in the async Sagemcom router client by adjusting how XPath strings are encoded (to support attribute selectors containing @ and "), adds a new bulk setter API for setting multiple values in one request, and updates the README to match the project’s declared minimum Python version.

Changes:

• Route get_value_by_xpath through get_values_by_xpaths and expand XPath quoting “safe” characters to include @ and ".
• Add set_values_by_xpaths to set multiple XPath/value pairs in a single API call (and refactor set_value_by_xpath to use it).
• Update README minimum Python version to 3.11+ (aligned with pyproject.toml).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
sagemcom_api/client.py	Adjust XPath escaping and add a bulk setter API for multi-action setValue requests.
README.md	Update stated minimum Python version to match project metadata.

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[WASDi]

I am using the library directly. Thanks for making it!

[iMicknl]

Thanks!