fix: correct rent unit labels and monthly/annual calculation consistency

- NeedAlignmentPanel: display budget row in monthly (CHF/m²/Mt.) to match
  the Preis section, use exact division (no Math.round) to avoid 13×12≠152
- MatchDetailPropertySections + PropertyDetailPublicSections: replace
  Math.round(rentPricePerSqm/12) with exact division; show 2 decimal places
  when monthly is not a whole number (e.g. CHF 12.67 instead of CHF 13)
- Add /Jahr suffix to all 15 displays showing rentPricePerSqm or maxPerSqm
  without a time unit across results, compare, match-detail, supply, and
  anfragencenter components

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

src/components/match-detail/PropertyOverviewPanel.tsx

@@ -39,7 +39,7 @@ export function PropertyOverviewPanel({ match, property, signal }: Props) {
   ] : [
     { icon: <MapPin size={15} />, label: 'Standort', value: property ? `${property.location.city}${property.location.district ? `, ${property.location.district}` : ''}` : '–' },
     { icon: <Maximize2 size={15} />, label: 'Nutzfläche', value: property ? `${property.areaSqm} m²` : '–' },
-    { icon: <Banknote size={15} />, label: 'Mietpreis', value: property?.rentPricePerSqm ? `CHF ${property.rentPricePerSqm}/m²` : '–' },
+    { icon: <Banknote size={15} />, label: 'Mietpreis', value: property?.rentPricePerSqm ? `CHF ${property.rentPricePerSqm}/m²/Jahr` : '–' },
     { icon: <Calendar size={15} />, label: 'Verfügbar ab', value: property?.availabilityDate ?? '–' },
     { icon: <Tag size={15} />, label: 'Objekttyp', value: property?.assetType ?? '–' },
   ]