refactor: architecture compliance pass — DS tokens, hook boundary, god component split, AI hardening

- DS token migration: Anfragen.tsx + child components (AnfragenInquiryItem, AnfragenMessageBubble)
  fully migrated; DS_TEXT.brandDark added; scoreTheme.ts moved to src/lib/ with re-export proxy
- Hook boundary: Results.tsx no longer calls needService directly — routes through useNeeds()
  with optional refetchOnMount/gcTime overrides
- NewListing.tsx (440L) split into useNewListingForm hook + 8 section components under
  src/components/new-listing/; page shell reduced to 121 lines
- AI hardening: Zod .strict() on all schemas, AIProvenance extended with schemaVersion/
  fallbackReason/traceId/latencyMs, AITraceStore stats with p50/p90/p99 + failure breakdowns,
  MockAIService buildFollowUpQuestions with priority ordering + area-ambiguity detection,
  prompt templates updated (LIGHT_INDUSTRIAL, budget unit, ambiguity detection, decimal precision)
- Tests: all 154 passing; fixed test regression caused by OfferEmailResponseSchema body min(50)

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

src/hooks/useNeeds.ts

@@ -2,11 +2,17 @@ import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { needService } from '../services/needService'
 import type { CreateNeedInput } from '../domain/need'
 
-export function useNeeds() {
+interface UseNeedsOptions {
+  refetchOnMount?: boolean | 'always'
+  gcTime?: number
+}
+
+export function useNeeds(options?: UseNeedsOptions) {
   return useQuery({
     queryKey: ['needs'],
     queryFn: () => needService.getAll(),
     select: (res) => res.data ?? [],
+    ...options,
   })
 }