fix: clear stale search criteria on text edit, fix Zürich false-positive, improve cost breakdown and fit-out labels

- AISearch: clear parsed criteria when user manually edits text input so stale locations (e.g. Zürich) no longer persist after retyping
- needParser: fix ZURICH_SIGNALS substring bug — "kreis N" now uses word-boundary regex so "umkreis 22" no longer matches "kreis 2"
- CompareTableBody: row 9 shows full cost breakdown (Miete + NK + amortised fit-out) using FITOUT_AMORTIZATION_YEARS from constants
- FitOutCostPanel: replace local AMORTIZATION_YEARS with FITOUT_AMORTIZATION_YEARS from constants.ts (single source of truth)
- constants.ts: add FITOUT_AMORTIZATION_YEARS = 5 — change here to affect all cost calculations
- PropertyIntelligenceCard: translate raw fitOut enum to German labels (Rohbau/Grundausbau/Vollausbau/Premium-Ausbau) with explanatory tooltips; add tooltip on contract duration chip

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

src/services/ai/mock/needParser.ts

@@ -47,14 +47,17 @@ export function mockParseNeed(input: string): ParseNeedResult {
     return re.test(lower)
   }).map(([, v]) => v)
 
-  // Infer Zürich when Zürich-specific districts or landmarks are mentioned
-  const ZURICH_SIGNALS = [
+  // Infer Zürich when Zürich-specific districts or landmarks are mentioned.
+  // "kreis N" patterns require a word boundary so "umkreis 22" does NOT match "kreis 2".
+  const ZURICH_SIGNAL_WORDS = [
     'seefeld', 'bellevue', 'paradeplatz', 'bahnhofstrasse', 'zürich-west', 'zürich west',
-    'oerlikon', 'altstetten', 'kreis 1', 'kreis 2', 'kreis 3', 'kreis 4', 'kreis 5',
-    'kreis 6', 'kreis 7', 'kreis 8', 'langstrasse', 'hardbrücke', 'freilager',
+    'oerlikon', 'altstetten', 'langstrasse', 'hardbrücke', 'freilager',
     'europaallee', 'zürich nord', 'zürich süd',
   ]
-  if (!preferredLocations.includes('Zürich') && ZURICH_SIGNALS.some(s => lower.includes(s))) {
+  const ZURICH_KREIS_RE = /(?<![a-zA-ZäöüÄÖÜß])kreis\s+[1-8](?![0-9a-zA-ZäöüÄÖÜß])/
+  if (!preferredLocations.includes('Zürich') && (
+    ZURICH_SIGNAL_WORDS.some(s => lower.includes(s)) || ZURICH_KREIS_RE.test(lower)
+  )) {
     preferredLocations.push('Zürich')
   }