feat: F030 Anfragencenter — Aktive & Latente Anfragen + Angebot-Wizard

Neuer Menüpunkt «Anfragencenter» (ehemals «Eingehende Bedarfe»):

Aktive Anfragen:
- Split-View: Anfrageliste (Liste/Grid-Toggle) + Chat-Detailansicht
- Chat-Verlauf mit Sender-Styling (Mieter links, Supply rechts)
- Antwortformular mit Betreff, Nachricht, Anhänge, Statuswechsel
- Zugehörige Property Card neben dem Chat

Latente Anfragen:
- Drei-Spalten-Layout: Need-Liste | Need-Detail | Eigene Objekte
- Need Cards mit AI-Zusammenfassung, Must-Haves, Präferenzen
- Eigene Portfolio-Objekte sortiert nach deterministischem Match-Score
- Checkbox-Selektion für Angebotsauswahl

Angebot-Wizard (4 Schritte):
- Schritt 1: Objekte auswählen (mit Score-Vorschau)
- Schritt 2: PDF-Vorschau + editierbare Textfelder
- Schritt 3: Angebot prüfen & bestätigen
- Schritt 4: Nachricht an Suchenden mit KI-generierter Mail

Architektur:
- Domain: Inquiry, LatentNeed, OfferDraft Types
- Provider: IInquiryProvider, ILatentNeedProvider, IOfferProvider + Mockups
- Services: inquiryService, latentNeedService, offerService
- Hooks: useInquiries, useLatentNeeds, useOffers (TanStack Query)
- Store: offerWizardStore (Zustand, lokaler Wizard-State)
- 27 neue Komponenten, alle Loading/Empty/Error States

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

src/components/anfragencenter/index.ts

@@ -0,0 +1,26 @@
+export { ActiveInquiriesTab } from './ActiveInquiriesTab'
+export { LatentInquiriesTab } from './LatentInquiriesTab'
+export { OfferWizard } from './OfferWizard'
+export { InquiryList } from './InquiryList'
+export { InquiryListRow } from './InquiryListRow'
+export { InquiryCard } from './InquiryCard'
+export { InquiryCardGrid } from './InquiryCardGrid'
+export { InquiryChat } from './InquiryChat'
+export { InquiryMessageBubble } from './InquiryMessageBubble'
+export { InquiryReplyComposer } from './InquiryReplyComposer'
+export { InquiryDetailPanel } from './InquiryDetailPanel'
+export { InquiryStatusBadge } from './InquiryStatusBadge'
+export { RelatedPropertyCardPanel } from './RelatedPropertyCardPanel'
+export { PublicNeedList } from './PublicNeedList'
+export { PublicNeedCard } from './PublicNeedCard'
+export { PublicNeedDetail } from './PublicNeedDetail'
+export { OwnPropertyMatchList } from './OwnPropertyMatchList'
+export { SelectablePropertyMatchCard } from './SelectablePropertyMatchCard'
+export { OfferCreationPanel } from './OfferCreationPanel'
+export { OfferPropertySelectionStep } from './OfferPropertySelectionStep'
+export { OfferPdfReviewStep } from './OfferPdfReviewStep'
+export { OfferCheckedAction } from './OfferCheckedAction'
+export { OfferChatComposer } from './OfferChatComposer'
+export { AiOfferEmailButton } from './AiOfferEmailButton'
+export { EditableOfferFieldList } from './EditableOfferFieldList'
+export { MockPdfPreview } from './MockPdfPreview'