feat(supply): unit-centric fit-out & overview — per-unit fit-out, editable demand budget, multi-unit price/availability

- domain/unit: optional per-unit fitOut override (falls back to property.hardFacts.fitOut)
- matchSyncService: pre-market unit scored with its own fitOut; matchCardAdapter prefers unit fitOut
- PreMarketUnitGrid/PreMarketPanel: per-unit Ausbaustandard override in the release list (default "Wie Objekt")
- PropertyDetailOverview: edit/read "Wer baut aus?" for existing listings (SHELL/BASIC), central FIT_OUT_LABELS
- Phase 1 unit-centric overview: header shows area+count, price as range, "Verfügbar ab → pro Einheit"; unit table shows per-unit price + availability; "Objekt & Lage" labels marked as object-defaults for multi-unit
- NeedExtendedRequirements: "Eigenes Ausbaubudget" only shown when min fit-out set + clearer helper text
- UnitStructurePanel: spin-off prefill carries fitOutByLandlord

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/supply/PreMarketPanel.tsx

@@ -27,6 +27,9 @@ export function PreMarketPanel({ p }: { p: Property }) {
     }
     return init
   })
+  const [unitFitOut, setUnitFitOut] = useState<Record<string, string>>(() =>
+    Object.fromEntries((p.units ?? []).map(u => [u.id, u.fitOut ?? ''])),
+  )
   const [unitSaving, setUnitSaving] = useState<Record<string, boolean>>({})
   const queryClient = useQueryClient()
   const updateProperty = useUpdateProperty()
@@ -96,6 +99,23 @@ export function PreMarketPanel({ p }: { p: Property }) {
     }
   }
 
+  async function saveUnitFitOut(unitId: string, fitOut: string) {
+    setUnitFitOut(prev => ({ ...prev, [unitId]: fitOut }))
+    setUnitSaving(prev => ({ ...prev, [unitId]: true }))
+    try {
+      await MockupUnitProvider.update(unitId, {
+        fitOut: (fitOut || undefined) as 'SHELL' | 'BASIC' | 'FULL' | 'PREMIUM' | undefined,
+      })
+      await queryClient.invalidateQueries({ queryKey: ['property', p.id] })
+      await queryClient.invalidateQueries({ queryKey: ['properties'] })
+      await queryClient.invalidateQueries({ queryKey: ['matches'] })
+    } catch {
+      showToast('Fehler beim Speichern des Ausbaustandards.', 'error')
+    } finally {
+      setUnitSaving(prev => ({ ...prev, [unitId]: false }))
+    }
+  }
+
   return (
     <>
       <Divider sx={{ my: 2 }} />
@@ -193,6 +213,9 @@ export function PreMarketPanel({ p }: { p: Property }) {
                 unitSaving={unitSaving}
                 setUnitStates={setUnitStates}
                 saveUnit={saveUnit}
+                propertyFitOut={p.hardFacts?.fitOut}
+                unitFitOut={unitFitOut}
+                saveUnitFitOut={saveUnitFitOut}
               />
             )}