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/base/MsgBase.py

@@ -58,7 +58,6 @@ class MsgBase:
         except RuntimeError:
             self._logger = None
 
-
     def _showMsg(
         self,
         msg: str
@@ -66,7 +65,6 @@ class MsgBase:
 
         self._output_queue.put(f"[{self._class_name:<15}] >>> : {msg}")
 
-
     def _showTrace(
         self,
         msg: str,
@@ -79,7 +77,6 @@ class MsgBase:
         if self._logger and not no_log:
             self._logger.log(level, msg)
 
-
     def _showLog(
         self,
         msg: str,
@@ -89,7 +86,6 @@ class MsgBase:
         if self._logger:
             self._logger.log(level, msg)
 
-
     def _waitMsg(
         self,
         timeout: float = 1.0