fix: Use GROQ_API instead of GROQ_API_KEY

modules/text_story/router.py

@@ -248,9 +248,9 @@ async def ai_generate_conversation(request: AiGenerateRequest):
     import aiohttp
     import json
     
-    groq_api_key = os.getenv("GROQ_API_KEY", "")
+    groq_api_key = os.getenv("GROQ_API", "")
     if not groq_api_key:
-        raise HTTPException(status_code=500, detail="GROQ_API_KEY not configured")
+        raise HTTPException(status_code=500, detail="GROQ_API not configured")
     
     # Tone descriptions
     tone_prompts = {