refactor(style): 统一项目代码风格，整理导入顺序、间距规范与方法排列

- GUI 模块统一 QtCore → QtGui → QtWidgets 导入排列，各类独占一行按字母排序
- 统一类间两空行、类内方法间一空行、函数间一空行的间距规范
- 统一方法排列顺序：__init__ → setupUi → connectSignals → public → Slot → private
- 统一 _widgets 中 ConditionRowFrame/ActionStepFrame 方法命名（populate* / toScript / updateValueWidget）
- LibTimeSelector 迁入 operators/abs 抽象层

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/utils/JSONWriter.py

@@ -46,7 +46,6 @@ class JSONWriter:
         self.__json_data = json_data.copy() if json_data is not None else {}
         self.__write()
 
-
     def __write(
         self
     ):
@@ -63,7 +62,6 @@ class JSONWriter:
         except Exception as e:
             raise Exception(f"写入文件时发生未知错误: {e}") from e
 
-
     def write(
         self
     ) -> bool:
@@ -74,7 +72,6 @@ class JSONWriter:
             return False
         return True
 
-
     def path(
         self
     ) -> str: