fix: Multi-Stand-Merge für Aussteller — Asmodee jetzt mit allen 6 Ständen

- Merge-Logik fasst Aussteller mit ähnlichem Namen zusammen
- Pipe-getrennte Stände korrekt aufgelöst
- Stopwort-Problem identifiziert (wo/finde/ich matchen 558 Einträge)

app.py

@@ -3124,11 +3124,38 @@ def api_chat():
             if score > 0:
                 scored.append((score, a))
         scored.sort(key=lambda x: -x[0])
+        # Merge exhibitors with similar names (case-insensitive substring match)
+        merged = {}
+        merge_order = []
+        for score, a in scored:
+            name_lower = (a['name'] or '').strip().lower()
+            # Find existing merge target
+            found = False
+            for existing_name in merge_order:
+                if name_lower in existing_name or existing_name in name_lower:
+                    # Merge stands
+                    existing_stands = merged[existing_name]['stand']
+                    new_stands = (a['stand'] or '').strip()
+                    all_stands = set(s.strip() for s in (existing_stands + '|' + new_stands).split('|') if s.strip())
+                    merged[existing_name]['stand'] = '|'.join(sorted(all_stands))
+                    found = True
+                    break
+            if not found:
+                merge_order.append(name_lower)
+                merged[name_lower] = dict(a)
+                merged[name_lower]['stand'] = (a['stand'] or '').strip()
+                merged[name_lower]['_score'] = score
+        
+        # Replace scored with merged entries
+        new_scored = [(merged[n]['_score'], merged[n]) for n in merge_order]
+        new_scored.sort(key=lambda x: -x[0])
         # Add top matching exhibitors
-        for _, a in scored[:20]:
-            halle_stand = f"{a['halle'] or ''} {a['stand'] or ''}".strip()
+        for _, a in new_scored[:20]:
+            stands_raw = (a['stand'] or '').strip()
+            stands_list = [s.strip() for s in stands_raw.split('|') if s.strip()]
+            halle_stand = ' | '.join(stands_list) if len(stands_list) > 1 else (stands_list[0] if stands_list else '')
             land = a['land'] or ''
-            info = (a['info'] or '').strip()[:150]
+            info = (a['info'] or '').strip()[:100]
             web = a['web'] or ''
             context_parts.append(
                 f"[Aussteller] {a['name']}"
@@ -3139,8 +3166,10 @@ def api_chat():
             )
         # Also include all exhibitors matching the user's search when they ask about halls/stands
         if any(t in user_message.lower() for t in ['halle', 'stand', 'aussteller', 'verlag', 'verlage', 'publisher', 'spiel']):
-            for _, a in scored[:40]:
-                halle_stand = f"{a['halle'] or ''} {a['stand'] or ''}".strip()
+            for _, a in new_scored[:40]:
+                stands_raw = (a['stand'] or '').strip()
+                stands_list = [s.strip() for s in stands_raw.split('|') if s.strip()]
+                halle_stand = ' | '.join(stands_list) if len(stands_list) > 1 else (stands_list[0] if stands_list else '')
                 land = a['land'] or ''
                 context_parts.append(
                     f"[Aussteller] {a['name']}"