修改导入顺序

app/core/__init__.py

@@ -4,7 +4,14 @@ Core functionality package
 from app.core.env_checker import check_environment
 from app.core.venv_manager import check_virtualenv
 from app.core.dependency_manager import check_dependencies
+
+
+def __getattr__(name):
+    """延迟导入，只在首次使用时才导入模块"""
+    if name == 'AppLauncher':
         from app.core.launcher import AppLauncher
+        return AppLauncher
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
 
 __all__ = [
     'check_environment',

app/core/launcher.py

@@ -7,8 +7,6 @@ from pathlib import Path
 from app.core.env_checker import check_environment
 from app.core.venv_manager import check_virtualenv
 from app.core.dependency_manager import check_dependencies
-from app.utils.logger import get_logger
-from app.utils.thread_pool_manager import block_main_thread, thread_pool_manager
 
 
 class AppLauncher:
@@ -22,6 +20,8 @@ class AppLauncher:
             project_root: 项目根目录路径
         """
         self.project_root = project_root
+        # 延迟导入logger
+        from app.utils.logger import get_logger
         self.logger = get_logger()
 
     def run(self):
@@ -52,6 +52,8 @@ class AppLauncher:
 def start():
     """启动应用服务"""
     from app.core.rainfall_manager import rainfall_manager
+    from app.utils.logger import get_logger
+    from app.utils.thread_pool_manager import block_main_thread, thread_pool_manager
 
     logger = get_logger()
 

app/utils/__init__.py

@@ -1,7 +1,25 @@
 """
 Utility functions package
 """
+
+
+def __getattr__(name):
+    """延迟导入，只在首次使用时才导入模块"""
+    if name in ('db_helper', 'PostgresSQLHelper'):
         from app.utils.db_helper import db_helper, PostgresSQLHelper
-from app.utils.thread_pool_manager import thread_pool_manager, ThreadPoolManager, block_main_thread
+        return db_helper if name == 'db_helper' else PostgresSQLHelper
+    elif name in ('thread_pool_manager', 'ThreadPoolManager', 'block_main_thread'):
+        from app.utils.thread_pool_manager import (
+            thread_pool_manager,
+            ThreadPoolManager,
+            block_main_thread
+        )
+        if name == 'thread_pool_manager':
+            return thread_pool_manager
+        elif name == 'ThreadPoolManager':
+            return ThreadPoolManager
+        else:
+            return block_main_thread
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
 
 __all__ = ['db_helper', 'PostgresSQLHelper', 'thread_pool_manager', 'ThreadPoolManager', 'block_main_thread']