feat: initial functional release

[coolcat-lox]

Overview

This PR introduces the first functional version of mitool-cli. The utility now supports basic interaction with Xiaomi OTA servers, including secure message exchange and device metadata parsing.

Key Features

• OTA Server Integration: Established communication protocols with Xiaomi's OTA infrastructure.
• Security: Implemented message encryption/decryption logic for secure data exchange between the utility and the server.
• Version Parsing: Added logic to identify and parse the current OS version directly from the device.
• UI/UX: Added an optional ASCII art banner on startup.

New Commands & Flags

Command	Description
--os-version	Sets the target OS version installed on the device.
--device	Specifies the device codename (e.g., vayu, sweet).
--no-banner	Disables the ASCII logo for a cleaner terminal output.

Important Notes ⚠️

Please be aware of the following current limitations:

• The utility does not provide direct download links yet.
• Support for fetching legacy/old firmware versions is currently not implemented.
• This is an initial release focused on core connectivity and encryption.