fix: decrypt api_key before calling LLM in cockpit_chat

wwwroot/api/cockpit_chat.dspy

@@ -143,7 +143,7 @@ async def _build_context(sor, iteration_id, task_id, max_msgs, system_prompt):
 async def _call_llm(model_info, messages, temperature):
     """Call LLM API directly using model config from llm table."""
     api_base = model_info.api_base.rstrip('/')
-    api_key = model_info.api_key
+    api_key = password_decode(model_info.api_key) if model_info.api_key else ''
     model_id = model_info.model_id
 
     headers = {