fix: use datetime.now instead of ServerEnv in _generate_sub_reseller_code

supplychain/init.py

@@ -79,9 +79,8 @@ WHERE resellerid = ${resellerid}$ AND contract_code LIKE ${prefix}$"""
 
 def _generate_sub_reseller_code(resellerid):
     """Generate unique sub-reseller code: SR-{YYYYMMDD}-{seq}."""
-    env = ServerEnv()
-    today = env.strdate(env.today())
-    prefix = f"SR-{today.replace('-', '')}"
+    today = datetime.now().strftime("%Y%m%d")
+    prefix = f"SR-{today}"
     db, dbname = _get_sor()
     with db.sqlorContext(dbname) as sor:
         sql = """SELECT COUNT(*) as cnt FROM sub_resellers