Switch back to GPT-4 standard for more detailed and creative prompts

GPT-4 Turbo was generating short, basic prompts with few variables.
GPT-4 standard typically produces more detailed, creative responses
with richer variable sets and better prompt quality.

Expected improvement:
✅ Longer, more detailed prompts
✅ More variables (3-7 as requested in template)
✅ Better contextual understanding
✅ More professional and comprehensive outputs

app.py

@@ -89,7 +89,7 @@ def call_openai_api(prompt_text, max_tokens=4000):
         }
         
         data = {
-            "model": "gpt-4-turbo",
+            "model": "gpt-4",
             "messages": [
                 {
                     "role": "system",