Second prerelease

Refines the OS detection mechanism for improved accuracy and broader coverage.

Key changes:

• detectOS method in DeviceVendor.kt no longer takes manufacturer and detectedBrand as parameters.
• OS detection logic now relies solely on system properties.
• Property values are converted to lowercase for case-insensitive comparisons.
• Added detection for BBK Funtouch OS and improved detection for ColorOS.
• Introduced BBK_FUNTOUCH_OS to the DeviceOS enum.