few final changes

app/main_api.py

@@ -985,10 +985,20 @@ doc_processor = UniversalDocumentProcessor()
 kaggle_client = LazyKaggleModelClient()
 
 # --- API MODELS ---
+# In main_api.py
+from pydantic import BaseModel, validator
+from typing import List
+
 class SubmissionRequest(BaseModel):
     documents: List[str]
     questions: List[str]
 
+    @validator('documents', pre=True)
+    def allow_single_string(cls, v):
+        if isinstance(v, str):
+            return [v] # Automatically convert string to a list
+        return v
+
 class SubmissionResponse(BaseModel):
     answers: List[str]