feat(ai): AI pre-market rent recommendation from regional comparables, supply & demand

- IAIService.recommendPreMarketRent: recommended price + range, verdict (UNDERPRICED/FAIR/AMBITIOUS), drivers, rationale, confidence
- MockAIService: deterministic recommendation from locationIntelligence — regional comp median, vacancy (supply), demand strength + days-on-market, rent trend (forward for pre-market)
- BackendAIService: LLM prompt with market context + mock fallback
- usePreMarketRentRecommendation hook; PreMarketPriceAdvisor component shows the recommendation per released unit with verdict ("zu günstig" when underpriced) + adjustable expected price + "Empfehlung übernehmen"
- Replaces the simple indexed suggestion with a market-driven AI recommendation that flags underpricing

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

src/services/ai/IAIService.ts

@@ -176,6 +176,27 @@ export interface FitOutAdvice {
   estimatedNetInvestment: string
 }
 
+// ── Pre-market rent recommendation ─────────────────────────────────────────────
+
+export interface PreMarketRentInput {
+  city: string
+  assetType: string
+  areaSqm: number
+  currentRentPerSqm: number
+  availableFrom?: string   // ISO — Pre-Market liegt in der Zukunft
+}
+
+export interface PreMarketRentRecommendation {
+  recommendedPerSqm: number
+  rangeMinPerSqm: number
+  rangeMaxPerSqm: number
+  verdict: 'UNDERPRICED' | 'FAIR' | 'AMBITIOUS'   // Bewertung des heutigen Preises
+  deltaVsCurrentPct: number                        // Empfehlung vs. heutiger Preis
+  drivers: string[]                                // Vergleichsmiete, Angebot, Nachfrage, Trend …
+  rationale: string
+  confidence: 'LOW' | 'MEDIUM' | 'HIGH'
+}
+
 // ── Legacy types (kept for backward compatibility) ────────────────────────────
 
 export interface CriteriaExtractionResult {
@@ -220,6 +241,9 @@ export interface IAIService {
   // Fit-out investment advice (demand side)
   generateFitOutAdvice(input: FitOutAdviceInput): Promise<AIResponse<FitOutAdvice>>
 
+  // Pre-market rent recommendation (supply side) — based on regional comparables, supply & demand
+  recommendPreMarketRent(input: PreMarketRentInput): Promise<AIResponse<PreMarketRentRecommendation>>
+
   // Legacy methods
   extractCriteria(input: string): Promise<AIResponse<CriteriaExtractionResult>>
   generateFollowUp(partialNeed: Partial<CreateNeedInput>): Promise<AIResponse<string[]>>