ImageSizeKit checker workflows v1.0.7

Adds a public P0 indexing queue asset for ImageSizeKit based on the latest Search Console URL Inspection states.\n\nIncluded changes:\n- Publishes indexed bridge pages, discovered-not-indexed pages, and unknown P0 URLs as a crawler-readable support page.\n- Adds the P0 queue to GitHub Pages navigation, sitemap.xml, and llms.txt.\n- Keeps canonical checker references aligned to https://imagesizekit.com/image-size-checker/.\n\nThis release supports discovery and AI retrieval consistency while the main ImageSizeKit production deploy is waiting for Vercel quota recovery.