feat: add chat completions test endpoint to validate OpenAI integration and improve error handling

backend/app/main.py

@@ -77,18 +77,18 @@ async def test_openai():
     """Test OpenAI connection without making actual API calls"""
     try:
         from .core.config import settings
-
+        
         if not settings.OPENAI_API_KEY:
             return {"status": "error", "message": "OPENAI_API_KEY not configured"}
-
+        
         api_key_preview = (
             settings.OPENAI_API_KEY[:10] + "..."
             if len(settings.OPENAI_API_KEY) > 10
             else "Too short"
         )
-
+        
         return {
-            "status": "ok",
+            "status": "ok", 
             "message": "OpenAI API key is configured",
             "api_key_preview": api_key_preview,
             "environment": (
@@ -98,6 +98,42 @@ async def test_openai():
     except Exception as e:
         return {"status": "error", "message": f"OpenAI configuration error: {str(e)}"}
 
+# Test chat completions endpoint
+@app.get("/api/test-chat")
+async def test_chat():
+    """Test if OpenAI chat completions work on Hugging Face"""
+    try:
+        from .core.config import settings
+        from openai import OpenAI
+        
+        if not settings.OPENAI_API_KEY:
+            return {"status": "error", "message": "OPENAI_API_KEY not configured"}
+        
+        client = OpenAI(api_key=settings.OPENAI_API_KEY, timeout=30.0)
+        
+        # Test a simple chat completion
+        response = client.chat.completions.create(
+            model="gpt-3.5-turbo",
+            messages=[
+                {"role": "user", "content": "Say 'Hello from Hugging Face!' in exactly those words."}
+            ],
+            max_tokens=20
+        )
+        
+        return {
+            "status": "success",
+            "message": "Chat completions work!",
+            "response": response.choices[0].message.content,
+            "model": response.model
+        }
+        
+    except Exception as e:
+        return {
+            "status": "error", 
+            "message": f"Chat completion failed: {str(e)}",
+            "error_type": type(e).__name__
+        }
+
 
 # Include API router
 app.include_router(api_router, prefix=settings.API_V1_STR)