Fix AttributeError in system instruction injection

api/routes.py

@@ -90,11 +90,15 @@ async def create_message(
 
         # --- LANGUAGE MATCHING FIX ---
         # Add a system-level hint to ensure the AI responds in the user's language
-        language_hint = {
-            "role": "system", 
-            "content": "You must always respond in the same language as the user's last message. If the user speaks Arabic, reply in Arabic. If they speak English, reply in English."
-        }
-        request_data.messages.insert(0, language_hint)
+        lang_instruction = "You must always respond in the same language as the user's last message. If the user speaks Arabic, reply in Arabic. If they speak English, reply in English."
+        
+        if not request_data.system:
+            request_data.system = lang_instruction
+        elif isinstance(request_data.system, str):
+            request_data.system = f"{lang_instruction}\n\n{request_data.system}"
+        elif isinstance(request_data.system, list):
+            from .models.anthropic import SystemContent
+            request_data.system.insert(0, SystemContent(type="text", text=lang_instruction))
         
         # Resolve provider from the model-aware mapping
         provider_type = Settings.parse_provider_type(