fix: 修复datetime.now()错误 - dspy预加载datetime模块非datetime.datetime

- set_customer_credit.dspy: datetime.now() → datetime.datetime.now()
- add_credit_limit.dspy: 删除import, 用datetime.datetime.now()
- update_credit_limit.dspy: 删除import, 用datetime.datetime.now()

wwwroot/credit_limit/add_credit_limit.dspy

@@ -12,9 +12,8 @@ ns['id'] = id
 ns['used_credit'] = 0
 ns['available_credit'] = float(ns.get('credit_limit', 0))
 ns['status'] = 'active'
-from datetime import datetime
-ns['created_at'] = datetime.now()
-ns['updated_at'] = datetime.now()
+ns['created_at'] = datetime.datetime.now()
+ns['updated_at'] = datetime.datetime.now()
 
 db = DBPools()
 dbname = get_module_dbname('accounting')

wwwroot/credit_limit/api/set_customer_credit.dspy

@@ -111,7 +111,7 @@ async with db.sqlorContext(dbname) as sor:
         debug(f'Updated credit limit {record_id} to {credit_limit_amount}')
     else:
         new_id = uuid()
-        now = datetime.now()
+        now = datetime.datetime.now()
         data = {
             'id': new_id,
             'accountid': accountid,

wwwroot/credit_limit/update_credit_limit.dspy

@@ -16,8 +16,7 @@ if 'credit_limit' in ns and ns['credit_limit'] is not None:
 			used = float(recs[0].get('used_credit', 0))
 			ns['available_credit'] = credit_limit_val - used
 
-from datetime import datetime
-ns['updated_at'] = datetime.now()
+ns['updated_at'] = datetime.datetime.now()
 
 db = DBPools()
 dbname = get_module_dbname('accounting')