* fix(models): correct download size metadata for whisper.cpp and VOSK
The size_mb values in WHISPERCPP_MODEL_INFO were using parameter counts instead of actual download sizes, causing the UI to display incorrect sizes (e.g., showing 39 MB when actual download is 74 MB). Updated all whisper.cpp models with verified sizes from Hugging Face and adjusted VOSK medium/large sizes to better represent actual downloads.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
* docs: update model download sizes to match actual downloads
Update whisper.cpp size references from parameter counts to verified download sizes (e.g., tiny: 39MB → 74MB, medium: 769MB → 1.5GB, large: 1.5GB → 3.0GB).
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
* docs(web): update model sizes across website pages
Sync whisper.cpp size references on gpu-acceleration, compare, whisper-model-guide, offline, and homepage with corrected download sizes.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
