feat: unit-first architecture — floor + street as primary card title

Every VERIFIED_PORTFOLIO property now has explicit units in mock data
(added to prop-002, prop-008, prop-009, prop-010, prop-011, prop-014).

PropertyUnit extracted to domain/unit.ts with formatFloorLabel,
formatUnitTitle, formatMultiUnitFloors helpers; re-exported from
property.ts so all existing imports are unaffected.

Cards now show floor + street as the primary title:
- Specific unit match: "1.OG Nord · Zollstrasse 12"
- Multi-unit (whole building): "1.OG–3.OG · Zollstrasse 12"
- EG retail: "EG Verkauf · Löwenplatz 3"
Building name (e.g. "Bürofläche Zollstrasse 12") appears as subtitle.
Both IntelligenceMatchCard (grid) and MatchCardCompact (list) updated.

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

src/components/match-card/MatchCardCompact.tsx

@@ -52,6 +52,11 @@ export function MatchCardCompact({ vm }: Props) {
         <Typography variant="subtitle1" sx={{ fontWeight: 600 }} noWrap>
           {vm.title}
         </Typography>
+        {vm.propertySubtitle && (
+          <Typography variant="caption" sx={{ display: 'block', color: '#64748b', fontWeight: 500, mt: 0.125 }} noWrap>
+            {vm.propertySubtitle}
+          </Typography>
+        )}
         <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.5, mt: 0.25 }}>
           <MapPin size={13} color="#64748b" />
           <Typography variant="body2" color="text.secondary">