feat: scale HIFFI pipeline to 500 artists with dual BVI ranking, dark dashboard, and Excel audit export

.streamlit/config.toml

@@ -0,0 +1,10 @@
+[theme]
+base = "dark"
+primaryColor = "#6366f1"
+backgroundColor = "#090d16"
+secondaryBackgroundColor = "#131b2e"
+textColor = "#f1f5f9"
+font = "sans serif"
+
+[client]
+toolbarMode = "minimal"