feat(demand): market rent estimate (asking vs. fair) + pre-market expected price

- lib/rentEstimate: deterministic market estimate from Standort-Intelligence (median rent benchmark + vacancy/trend) → fair rent, verdict BELOW/AT/ABOVE, deltaPct, rationale; suggestFutureRent indexes today's price by city rent trend
- MarketPricePanel in MatchDetail: asking vs. fair market rent + verdict badge + rationale; shows pre-market expected price (heute → erwartet)
- unit.expectedRentPerSqm: future pre-market price; scorer prefers it over current rent for FUTURE_AVAILABILITY
- UnitStructurePanel editor: expected-price field (with indexed suggestion) shown for pre-market-released units
- tests: rentEstimate verdict thresholds + future-rent indexing

Note: rent estimate is a deterministic market-data calc (not an LLM) — honest & testable; can be routed through IAIService later if a real model is wanted.

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

src/services/matchSyncService.ts

@@ -106,7 +106,9 @@ export function generateMatchesForNeed(need: Need): void {
       for (const unit of prop.units!) {
         if (!unit.schattenmarktRelease?.enabled) continue
         const facts = resolveUnitFacts(prop, unit)
-        const unitOutput = scoreProperty(need, prop, unit.areaSqm, unit.rentPricePerSqm ?? prop.rentPricePerSqm, ResultType.FUTURE_AVAILABILITY, {
+        // Pre-Market: erwarteter künftiger Preis hat Vorrang vor der heutigen Sollmiete
+        const unitPrice = unit.expectedRentPerSqm ?? unit.rentPricePerSqm ?? prop.rentPricePerSqm
+        const unitOutput = scoreProperty(need, prop, unit.areaSqm, unitPrice, ResultType.FUTURE_AVAILABILITY, {
           fitOut: facts.fitOut,
           mieterausbaubeitragPerSqm: facts.mabPerSqm,
           fitOutByLandlord: facts.fitOutByLandlord,