fix(theme): 主题系统交叉审查缺陷修复

启动恢复:
- _initializeAppearance 自定义主题加载失败时调用 clearTheme 回退配色方案

列表校验:
- listThemes 同时校验 info.json 和 theme.qss 完整性
- 损坏的主题文件记录 LogManager 警告并跳过
- 按 (名称, 作者) 去重，同一作者同名主题仅保留一个

导入保护:
- importTheme 新增 (名称, 作者) 冲突检查
- applyTheme 缺少 theme.qss 时抛出明确 ValueError

状态一致性:
- saveAndApply 在 syncRadioFromNeedTheme 后重新采集 THEME 再保存
- __original_theme / __original_custom_theme 随每次 Apply 同步更新
- Reset 按钮恢复组合框到原始位置并刷新状态标签

代码质量:
- 提取 _colorSchemeFor 静态方法消除 applyTheme/clearTheme 中的重复映射
- 移除未使用的 _applyTheme 死代码
- _active_style_name 默认值从 '' 改为 'Fusion'
- 日志调用统一使用 LogManager
- _applyCustomTheme 异常时通过 LogManager 记录详细错误

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/boot/AppInitializer.py

@@ -12,15 +12,14 @@ import os
 from PySide6.QtCore import QStandardPaths, QDir
 from PySide6.QtWidgets import QApplication
 
-from gui.ALSettingsWidget import (
-    _setActiveStyleName,
-    _applyTheme,
-)
 from interfaces.ConfigProvider import CfgKey
 from managers.config.ConfigManager import instance as configInstance
 from managers.driver.WebDriverManager import instance as webdriverInstance
 from managers.log.LogManager import instance as logInstance
-from managers.theme.ThemeManager import instance as themeInstance
+from managers.theme.ThemeManager import(
+    setActiveStyle,
+    instance as themeInstance
+)
 
 
 def _initializeLogManager(
@@ -82,14 +81,16 @@ def _initializeAppearance(
     saved_theme = cfg.get(CfgKey.GLOBAL.APPEARANCE.THEME, "system")
     saved_custom_theme = cfg.get(CfgKey.GLOBAL.APPEARANCE.CUSTOM_THEME, "")
     app.setStyle(saved_style)
-    _setActiveStyleName(saved_style)
+    setActiveStyle(saved_style)
     logger = logInstance().getLogger("AppInitializer")
     if saved_custom_theme:
         try:
             themeInstance().applyTheme(saved_custom_theme)
         except Exception:
-            logger.warning("无法应用自定义主题 '%s',回退到默认外观", saved_custom_theme)
-    _applyTheme(saved_theme)
+            logger.warning("无法应用自定义主题 '%s'，回退到默认外观", saved_custom_theme)
+            themeInstance().clearTheme(saved_theme)
+        return
+    themeInstance().clearTheme(saved_theme)
 
 def initializeApp(
 ) -> bool: