feat: Pipeline↔Anfragen integration + Compare→Pipeline + KI stage detection

Navigation: Deal Pipeline moved after Vergleich (before Anfragen)

Compare → Pipeline:
- Bookmark icon per column header; BookmarkCheck when already in pipeline
- Passes propertyId, propertyAddress, area/rent labels on save

Pipeline cards now unit-level:
- propertyAddress shown with MapPin on every card
- Chat icon (MessageSquare) on cards with linked inquiry → navigates to /demand/anfragen?inquiry=xxx
- Detail panel: Chat chip links to specific inquiry thread, propertyAddress displayed

Anfragen → Pipeline KI detection:
- Keyword scan on every sent message (besichtigung → VISITED, mietvertrag → NEGOTIATION, unterschrieben → CLOSED_WON)
- Only advances stage, never goes back
- Purple KI alert banner with direct Pipeline link, auto-dismisses after 6s
- Pipeline badge in inquiry list + stage chip in chat header with nav link
- URL param ?inquiry=xxx pre-selects inquiry (used from Pipeline chat button)

Domain: PipelineItem gains propertyId, unitId, propertyAddress, inquiryId
Mock data: pl-001/pl-002/pl-004 linked to inq-001/inq-005/inq-004

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

src/components/layout/AppShell.tsx

@@ -103,8 +103,8 @@ const WORKSPACE_CONFIG: Record<WorkspaceType, WorkspaceConfig> = {
       { path: '/demand/ai-search', label: 'Flächensuche', icon: Search },
       { path: '/demand/results', label: 'Ergebnisse', icon: List },
       { path: '/demand/compare', label: 'Vergleich', icon: Columns2 },
-      { path: '/demand/anfragen', label: 'Anfragen', icon: MessageSquare },
       { path: '/demand/pipeline', label: 'Deal Pipeline', icon: Kanban },
+      { path: '/demand/anfragen', label: 'Anfragen', icon: MessageSquare },
     ],
   },
 }