feat: add Maison Work source type, rename ExternalMarket to Direktinserat, hide own portfolio from demand search by default

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

src/components/badges/ResultTypeBadge.tsx

@@ -1,5 +1,5 @@
 import { Chip } from '@mui/material'
-import { ShieldCheck, Globe, Sparkles } from 'lucide-react'
+import { ShieldCheck, Globe, Building2, Sparkles } from 'lucide-react'
 import type { ResultType } from '../../domain/enums'
 import { DS_COLORS } from '../../lib/ds'
 import { RESULT_TYPE_LABELS } from '../../lib/constants'
@@ -12,6 +12,7 @@ interface ResultTypeBadgeProps {
 const ICONS: Record<ResultType, React.ElementType> = {
   VERIFIED_PORTFOLIO:  ShieldCheck,
   EXTERNAL_MARKET:     Globe,
+  MAISON_WORK:         Building2,
   FUTURE_AVAILABILITY: Sparkles,
 }