Fix: Fallback to gemini-pro model for stability

transcription-tool/backend/services/llm_service.py

@@ -27,7 +27,8 @@ def call_gemini_api(prompt: str, temperature: float = 0.7, retries: int = 3, tim
         logging.error("GEMINI_API_KEY environment variable not set.")
         raise ValueError("API key not found.")
 
-    url = f"https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash-latest:generateContent?key={api_key}"
+    # Fallback to the stable gemini-pro model to ensure functionality
+    url = f"https://generativelanguage.googleapis.com/v1beta/models/gemini-pro:generateContent?key={api_key}"
     headers = {'Content-Type': 'application/json'}
     payload = {
         "contents": [{