fix: remove hidden score modifiers + fix Zürich auto-inference false positive

Score formula simplified to: finalScore = round(hard×60% + soft×40%)
Removes dataQualityModifier, confidenceModifier, mustHaveEval.scoreImpact —
the breakdown panel now always matches the displayed score.

Also removes 'industrie groove' from Zürich-only location signals — the phrase
describes an aesthetic preference, not a district reference.

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

src/services/ai/mock/needParser.ts

@@ -60,8 +60,7 @@ export function mockParseNeed(input: string): ParseNeedResult {
 
   // Contextual Zürich inference: only truly Zürich-specific place/brand names
   const ZURICH_ONLY_SIGNALS = [
-    'industrie groove', 'industrie-groove',
-    'pfingstweidstrasse', 'hardbrücke', 'freilager', 'europaallee',
+    'pfingstweidstrasse', 'freilager', 'europaallee',
     'zürich-west', 'zürich west', 'zürich nord', 'zürich süd',
     'hürlimann', 'viadukt', 'schiffbau',
   ]