fix: 修复 __init__.py

src/budget/__init__.py

@@ -1,13 +1,12 @@
 from PyQt6.QtWidgets import *
 from PyQt6.QtCore import *
 
-from ._pg import PostgresTab
 
 class MainWindow(QMainWindow):
 
     def __init__(self):
         super().__init__()
         self.initUI()
-    
+    from ._pg import PostgresTab
     from ._mw import initUI, onTabChanged
     from ._category import CategoryTab