♻️ refactor(example): reorganize dotenv loading and spacing

- move dotenv loading closer to imports for better readability
- adjust spacing to improve code organization and clarity

Author: Oaklight

examples/cicada_tool_usage_example.py

@@ -2,18 +2,17 @@
 import os
 from pprint import pprint
 
-from dotenv import load_dotenv
-
-# Load environment variables from .env file
-load_dotenv()
-
 # pip install cicada-agent
 from cicada.core.model import MultiModalModel
 from cicada.core.utils import cprint
+from dotenv import load_dotenv
 
 from toolregistry import ToolRegistry
 from toolregistry.hub import UnitConverter
 
+# Load environment variables from .env file
+load_dotenv()
+
 model_name = os.getenv("MODEL", "deepseek-v3")
 stream = os.getenv("STREAM", "True").lower() == "true"  # Configurable stream option
 
@@ -29,11 +28,13 @@
 
 tool_registry = ToolRegistry()
 
+
 # register tools
 @tool_registry.register
 def get_weather(location: str):
     return f"Weather in {location}: Sunny, 25°C"
 
+
 # @tool_registry.register
 # def c_to_f(celsius: float) -> float:
 #     fahrenheit = (celsius * 1.8) + 32