fix: config saving and config loading

traderai/agent.py

@@ -13,6 +13,7 @@ from traderai.tools import ToolRegistry
 
 SYSTEM_PROMPT = """You are TraderAI, a local assistant for UEX marketplace work.
 Use tools when the user asks about UEX data, open/current listings, active negotiations, unread notifications, messages, offers, or posting ads.
+UEX credentials are configured server-side when available. Never ask the user to provide UEX_SECRET_KEY or UEX_BEARER_TOKEN in chat; call the authenticated UEX tool and only mention credential configuration if the tool returns an authentication error.
 Use the specific UEX tool for the needed endpoint, such as get_uex_commodities_prices or get_uex_vehicles. Use fields, limit, and summary mode so tool results stay compact.
 When the user asks for history, trends, changes over time, or past prices, prefer the summarize_uex_*_history tools when available; use search_uex_api_index(history_only=true) if you need to discover history endpoints.
 Prefer open and current UEX marketplace information. Do not use historical sale data, completed sale records, or sale/average-history information unless the user explicitly asks for historical sales.
@@ -215,6 +216,21 @@ class OllamaAgent:
         parts = [
             f"Current local date/time: {iso_now()} UTC; {iso_now_in_zone(local_zone)} {local_zone}.",
         ]
+        uex = getattr(self.tools, "uex", None)
+        if uex:
+            auth_methods = []
+            if uex.secret_key:
+                auth_methods.append("secret key")
+            if uex.bearer_token:
+                auth_methods.append("bearer token")
+            if auth_methods:
+                parts.append(
+                    "UEX API authentication is configured server-side with "
+                    + " and ".join(auth_methods)
+                    + "; use authenticated UEX tools directly and do not ask for tokens."
+                )
+            else:
+                parts.append("UEX API authentication is not configured server-side.")
         if self.user_name:
             parts.append(f"Known user name/handle: {self.user_name}.")