fix(blog): restore live blockquote styling and quote-mark SVG

- restores the migrated blog blockquotes to the live site’s visual treatment
- adds the self-hosted quote-mark SVG and matches its live positioning
- updates the extractor, audit scripts, and migration reports to reflect the blockquote work

www/reports/asset-inventory.csv

@@ -188,3 +188,4 @@ source,target,size,kind
 "live:https://www.azinstitute4autism.com/hubfs/hero-meet-the-aia-team.webp","public/assets/images/hero-meet-the-aia-team.webp","15310","images"
 "live:https://www.azinstitute4autism.com/hubfs/hero-schedule-aia-tour.webp","public/assets/images/hero-schedule-aia-tour.webp","13290","images"
 "live:https://www.azinstitute4autism.com/hubfs/hero-library-index.webp","public/assets/images/hero-library-index.webp","14392","images"
+"live:https://241905239.fs1.hubspotusercontent-na2.net/hubfs/241905239/raw_assets/public/@marketplace/MakeWebBetter/Academia/images/icons/blockquote.svg","public/assets/images/blockquote.svg","2400","images"