feat(prospecting): add complete prospecting module for lead discovery and scoring

Migrates scanning pipeline from marketing-.lu-domains app into Orion module.
Supports digital (domain scan) and offline (manual capture) lead channels
with enrichment, scoring, campaign management, and interaction tracking.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -190,3 +190,6 @@ static/shared/css/tailwind.css
 # Export files
 orion_letzshop_export_*.csv
 exports/
+
+# Security audit (needs revamping)
+scripts/security-audit/