Add unofficial translation files for Chinese Simplified, Hindi and Indonesian under setup-scripts/Languages/Unofficial. Also update Setup-windows.iss and Setup-windows-ffmpeg.iss to incorporate related installer changes.
Add Inno Setup compilation to the Windows CI: the workflow now installs Inno Setup via choco, adjusts PATH, and runs iscc to compile two installers (standard and -ffmpeg) using /DMyAppVersion,/DMyAppExeName and /DSourceDir, placing outputs into repo/artifacts and failing the job on non-zero exit. Also add two new Inno Setup scripts in setup-scripts/: Setup-windows.iss and Setup-windows-ffmpeg.iss. The scripts include metadata, multi-language support, file/icon/registry/run entries, and Pascal code to create or update the user's ytsage_config.json language setting; the -ffmpeg script adds an optional task to append the app folder to the user's PATH.
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