Rankings modality filter

Stored modality filter on each OpenRouter rankings file. Audio stores audio. Image input stores image. Image output stores image_output. Tool calling stores tool_calling. The daily file stores an empty filter object, so it stays off the page. The label is the rankings file. The value is the stored filters.modality string. The bar is full when a modality is stored. The bar is not a score. This is the rankings dataset modality filter, not the catalog modality. A file with no stored modality stays off the page.