fix: Complete Turkish character normalization

- Fixed İ character handling (must normalize BEFORE lower())
- Added all uppercase Turkish characters to normalization
- Added GPT-5 prompt instructions for Turkish characters
- Now all variations work: MARLİN, MARLIN, marlin, Marlin

All return correct price: 53,000 TL

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

smart_warehouse_with_price.py

@@ -49,15 +49,26 @@ def get_product_price_and_link(product_name, variant=None):
             
         root = ET.fromstring(xml_content)
         
-        # Normalize search terms
-        search_name = product_name.lower()
-        search_variant = variant.lower() if variant else ""
+        # Turkish character normalization FIRST (before lower())
+        tr_map = {
+            'İ': 'i', 'I': 'i', 'ı': 'i',  # All I variations to i
+            'Ğ': 'g', 'ğ': 'g',
+            'Ü': 'u', 'ü': 'u', 
+            'Ş': 's', 'ş': 's',
+            'Ö': 'o', 'ö': 'o',
+            'Ç': 'c', 'ç': 'c'
+        }
         
-        # Turkish character normalization
-        tr_map = {'ı': 'i', 'ğ': 'g', 'ü': 'u', 'ş': 's', 'ö': 'o', 'ç': 'c'}
+        # Apply normalization to original (before lower)
+        search_name_normalized = product_name
+        search_variant_normalized = variant if variant else ""
         for tr, en in tr_map.items():
-            search_name = search_name.replace(tr, en)
-            search_variant = search_variant.replace(tr, en)
+            search_name_normalized = search_name_normalized.replace(tr, en)
+            search_variant_normalized = search_variant_normalized.replace(tr, en)
+        
+        # Now lowercase
+        search_name = search_name_normalized.lower()
+        search_variant = search_variant_normalized.lower()
         
         best_match = None
         best_score = 0
@@ -303,6 +314,11 @@ If user asks about specific size (S, M, L, XL, XXL, SMALL, MEDIUM, LARGE, X-LARG
 If user asks generally (without size), return ALL variants of the product.
 {warehouse_filter}
 
+CRITICAL TURKISH CHARACTER RULES:
+- "MARLIN" and "MARLİN" are the SAME product (Turkish İ vs I)
+- Treat these as equivalent: I/İ/ı, Ö/ö, Ü/ü, Ş/ş, Ğ/ğ, Ç/ç
+- If user writes "Marlin", also match "MARLİN" in the list
+
 IMPORTANT BRAND AND PRODUCT TYPE RULES:
 - GOBIK: Spanish textile brand we import. When user asks about "gobik", return ALL products with "GOBIK" in the name.
 - Product names contain type information: FORMA (jersey/cycling shirt), TAYT (tights), İÇLİK (base layer), YAĞMURLUK (raincoat), etc.