fix the way to set api_key

app.py

@@ -52,7 +52,6 @@ class BasicAgent:
                     "model_name": "gemini-flash-family",
                     "litellm_params": {
                         "model": "gemini/gemini-2.5-flash",
-                        "api_key": os.getenv("API_KEY"),
                         "rpm": 10,
                         "tpm": 250_000,
                     },
@@ -62,7 +61,6 @@ class BasicAgent:
                     "model_name": "gemini-flash-family",
                     "litellm_params": {
                         "model": "gemini/gemini-2.0-flash",
-                        "api_key": os.getenv("API_KEY"),
                         "rpm": 15,
                         "tpm": 1_000_000,
                     },
@@ -72,7 +70,6 @@ class BasicAgent:
                     "model_name": "gemini-flash-family",
                     "litellm_params": {
                         "model": "gemini/gemini-2.0-flash-lite",
-                        "api_key": os.getenv("API_KEY"),
                         "rpm": 30,
                         "tpm": 1_000_000,
                     },
@@ -93,6 +90,7 @@ class BasicAgent:
                 AssemblyAIAudioTranscriptTool(),
             ], 
             model=model,
+            api_key=os.getenv("API_KEY"),
             # step_callbacks=[rate_limiter.increment_and_sleep_if_needed],
             additional_authorized_imports=["pandas", "openpyxl", "requests"],
             instructions=CUSTOM_PROMPT