fix(fees): stricter partial match to prevent false positives like AMA/ULTRAMARE

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/import_membership_fees.py

@@ -252,11 +252,16 @@ def import_fees(excel_path, target_year=None, all_years=False, dry_run=False):
             else:
                 company = company_map.get(rec['name'].upper())
             if not company:
-                # Try partial match
+                # Try partial match — but only if Excel name is a prefix/suffix of DB name
+                # (avoid "AMA" matching "ULTRAMARE")
+                excel_upper = rec['name'].upper().strip()
                 for key, c in company_map.items():
-                    if rec['name'].upper() in key or key in rec['name'].upper():
-                        company = c
-                        break
+                    # Excel name starts with DB name or DB name starts with Excel name
+                    # Minimum 4 chars to avoid false positives
+                    if len(excel_upper) >= 4 and len(key) >= 4:
+                        if key.startswith(excel_upper) or excel_upper.startswith(key):
+                            company = c
+                            break
 
             if not company:
                 unmatched.append(f"{rec['name']} ({year})")