[260811] Stop Letting API Tokens Run Naked: Unifying Secure Storage Across macOS, Linux, and Windows

X-cmd v0.10.2 introduces the `x keyring` module, a unified interface for securely storing and retrieving API tokens across macOS, Linux, and Windows by leveraging native OS secure storage like macOS Keychain, Linux Secret Service/KWallet, and Windows Credential Manager, avoiding the need for applications to manage decryption keys themselves. This allows shell scripts, automation tools, and AI agents to handle credentials securely without additional binary dependencies.

TLDR x keyring module introduced in x-cmd v0.10.2 aims to solve the secure storage challenges of sensitive credentials like API tokens. Instead of implementing its own encryption or file storage, it acts as a connection layer that uniformly calls native secure storage capabilities of the operating systems, such as macOS Keychain, Linux Secret Service/KWallet, and Windows Credential Manager. This design avoids the security risks of applications managing decryption keys themselves. Without introducing additional binary dependencies, it allows shell scripts, automation tools, and AI Agents to securely store and retrieve credentials through a unified interface, returning the security boundary to the operating system and enabling tools to focus on their core tasks.