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/src/styles/rtl.css

@@ -1,4 +1,3 @@
 [dir="rtl"] { text-align: right; }
 [dir="rtl"] .brand { margin-left: auto; margin-right: 0; }
 [dir="rtl"] .utility-inner { justify-content: flex-start; }
-[dir="rtl"] .prose blockquote { border-inline-end: 0; }