refactor: update imports after moving managers to separate module

* Remove manager class imports from core/__init__.py and update validator.py to import ConfigManager from new managers module location.

setup/core/__init__.py

@@ -1,15 +1,9 @@
 """Core modules for SuperClaude installation system"""
 
-from .config_manager import ConfigManager
-from .settings_manager import SettingsManager
-from .file_manager import FileManager
 from .validator import Validator
 from .registry import ComponentRegistry
 
 __all__ = [
-    'ConfigManager',
-    'SettingsManager', 
-    'FileManager',
     'Validator',
     'ComponentRegistry'
-]
+]

setup/core/validator.py

@@ -533,7 +533,7 @@ class Validator:
             Installation commands dict
         """
         try:
-            from .config_manager import ConfigManager
+            from ..managers.config_manager import ConfigManager
             from .. import PROJECT_ROOT
             
             config_manager = ConfigManager(PROJECT_ROOT / "config")
@@ -682,4 +682,4 @@ class Validator:
     
     def clear_cache(self) -> None:
         """Clear validation cache"""
-        self.validation_cache.clear()
+        self.validation_cache.clear()