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/anfragencenter/RelatedPropertyCardPanel.tsx

@@ -94,7 +94,7 @@ export function RelatedPropertyCardPanel({ propertyId, inquiryId }: RelatedPrope
         <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, color: '#475569', fontSize: '0.8125rem' }}>
           <Ruler size={14} />
           <Typography variant="body2" sx={{ fontSize: '0.8125rem' }}>
-            {property.areaSqm.toLocaleString('de-CH')} m² · CHF {property.rentPricePerSqm}/m²
+            {property.areaSqm.toLocaleString('de-CH')} m² · CHF {property.rentPricePerSqm}/m²/Jahr
           </Typography>
         </Box>
         <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, color: '#475569', fontSize: '0.8125rem' }}>
@@ -190,7 +190,7 @@ function AdditionalMatchCard({ match }: { match: AdditionalPropertyMatch }) {
           </Box>
         </Box>
         <Typography variant="caption" sx={{ color: '#64748b', fontSize: '0.7rem', display: 'block', mb: 0.5 }}>
-          {match.location} · {match.areaSqm.toLocaleString('de-CH')} m² · CHF {match.rentPricePerSqm}/m²
+          {match.location} · {match.areaSqm.toLocaleString('de-CH')} m² · CHF {match.rentPricePerSqm}/m²/Jahr
         </Typography>
         {match.reasons.length > 0 && (
           <Box sx={{ mb: 0.5 }}>