fix: resolve logging timing and import organization issues

- Move dotenv_values import to top level with load_dotenv
- Fix logging sequence issue by deferring ZEN_MCP_FORCE_ENV_OVERRIDE logs until after logger configuration
- Apply Black formatting to ensure consistent code style

server.py

@@ -31,33 +31,27 @@ from typing import Any, Optional
 # Try to load environment variables from .env file if dotenv is available
 # This is optional - environment variables can still be passed directly
 try:
-    from dotenv import load_dotenv
+    from dotenv import load_dotenv, dotenv_values
 
     # Load environment variables from .env file in the script's directory
     # This ensures .env is loaded regardless of the current working directory
     script_dir = Path(__file__).parent
     env_file = script_dir / ".env"
-    
+
     # First load only to read ZEN_MCP_FORCE_ENV_OVERRIDE, then reload with proper override setting
     # Use a temporary environment to read just this configuration variable
     temp_env = {}
     if env_file.exists():
-        from dotenv import dotenv_values
         temp_env = dotenv_values(env_file)
-    
+
     # Check if we should force override based on .env file content (not system env)
-    force_override = temp_env.get('ZEN_MCP_FORCE_ENV_OVERRIDE', 'false').lower() == 'true'
-    
+    force_override = temp_env.get("ZEN_MCP_FORCE_ENV_OVERRIDE", "false").lower() == "true"
+
     # Load .env file with appropriate override setting
     load_dotenv(dotenv_path=env_file, override=force_override)
-    
-    # Log the configuration choice
-    logger = logging.getLogger(__name__)
-    if force_override:
-        logger.info("ZEN_MCP_FORCE_ENV_OVERRIDE enabled - .env file values will override system environment variables")
-        logger.debug("Environment override prevents conflicts between different AI tools passing cached API keys")
-    else:
-        logger.debug("ZEN_MCP_FORCE_ENV_OVERRIDE disabled - system environment variables take precedence")
+
+    # Store override setting for logging after logger is configured
+    _zen_mcp_force_override = force_override
 except ImportError:
     # dotenv not available - this is fine, environment variables can still be passed directly
     # This commonly happens when running via uvx or in minimal environments
@@ -183,6 +177,20 @@ except Exception as e:
 
 logger = logging.getLogger(__name__)
 
+# Log ZEN_MCP_FORCE_ENV_OVERRIDE configuration if it was set during dotenv loading
+try:
+    if "_zen_mcp_force_override" in globals():
+        if _zen_mcp_force_override:
+            logger.info(
+                "ZEN_MCP_FORCE_ENV_OVERRIDE enabled - .env file values will override system environment variables"
+            )
+            logger.debug("Environment override prevents conflicts between different AI tools passing cached API keys")
+        else:
+            logger.debug("ZEN_MCP_FORCE_ENV_OVERRIDE disabled - system environment variables take precedence")
+except NameError:
+    # _zen_mcp_force_override not defined, which means dotenv wasn't available or no .env file
+    pass
+
 
 # Create the MCP server instance with a unique name identifier
 # This name is used by MCP clients to identify and connect to this specific server