v1.3.0 - Multilingual UI and Windows icon fix

Fixes the Windows executable shell icon with nine embedded icon sizes and PE resource validation. Fixes the Skill ZIP download and guide buttons through the Windows Shell with visible error reporting. Updates Doubao setup to Create Skill, Upload Skill, then upload the complete ZIP containing SKILL.md. Adds ten complete interface languages: Simplified Chinese, English, Hindi, Spanish, Arabic, French, Bengali, Portuguese, Russian, and Urdu. Verified by 31 automated tests, minimum-window visual checks, nine-layer icon validation, and packaged Qt self-test. SHA256: 4A5A99424BA27493565B3A5EC3D94D55368FBF89525982927E87265A7351C48A