fix: 修复gen_multi2过滤后无边的问题

根因: gen_test_data 第135行 cert_cn 生成有bug
  f'*.{random.choice(SERVICES).split(".")[-2:]}'
  → 产生 "*.['example', 'com']" 垃圾cnam
  → 过滤匹配不到任何有效IP
  → 所有节点度=1,无边

修复: 检测并清除垃圾cnam/snam模式,仅保留有效值

测试结果(筛选cnam=api.example.com):
  节点718, 边500, 最大度201, 平均度18.5
  服务器入度: 152-201

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

scripts/gen_multi2.py

@@ -145,11 +145,20 @@ def main():
         for ri in range(args.rows):
             row = _base_row(total_rows + ri, file_base)
 
-            # ── Remap IPs using topology ──
-            src_ip = row[':ips']
+            # ── Fix garbled cnam/snam from gen_test_data cert_cn bug ──
+            # gen_test_data line 135 generates "*.['example', 'com']" garbage
+            # via f'*.{random.choice(SERVICES).split(".")[-2:]}' — missing .join()
             snam_val = row.get('snam', '').strip()
             cnam_val = row.get('cnam', '').strip()
+            import re
+            if snam_val and snam_val != '' and re.match(r'^\*\.[\[\(]', snam_val):
+                row['snam'] = ''
+                snam_val = ''
+            if cnam_val and cnam_val != '' and re.match(r'^\*\.[\[\(]', cnam_val):
+                row['cnam'] = ''
+                cnam_val = ''
 
+            # ── Remap IPs using topology ──
             # Determine appropriate :ipd based on snam/cnam
             server_pool = None
             if snam_val and snam_val in SNAM_TO_IPS: