fix: load DeepSeek config from browser runtime

tests/runtime_task_flow_test.rs

@@ -74,39 +74,44 @@ fn submit_task_sends_three_commands_and_finishes_with_task_complete() {
 
     let sent = transport.sent_messages();
 
-    assert_eq!(sent.len(), 7);
+    assert_eq!(sent.len(), 8);
     assert!(matches!(
         &sent[0],
+        AgentMessage::LogEntry { level, message }
+            if level == "mode" && message == "deterministic_planner"
+    ));
+    assert!(matches!(
+        &sent[1],
         AgentMessage::LogEntry { level, message }
             if level == "info" && message == "navigate https://www.baidu.com"
     ));
     assert!(matches!(
-        &sent[1],
+        &sent[2],
         AgentMessage::Command { seq, action, .. }
             if *seq == 1 && action == &Action::Navigate
     ));
     assert!(matches!(
-        &sent[2],
+        &sent[3],
         AgentMessage::LogEntry { level, message }
             if level == "info" && message == "type 天气 into #kw"
     ));
     assert!(matches!(
-        &sent[3],
+        &sent[4],
         AgentMessage::Command { seq, action, .. }
             if *seq == 2 && action == &Action::Type
     ));
     assert!(matches!(
-        &sent[4],
+        &sent[5],
         AgentMessage::LogEntry { level, message }
             if level == "info" && message == "click #su"
     ));
     assert!(matches!(
-        &sent[5],
+        &sent[6],
         AgentMessage::Command { seq, action, .. }
             if *seq == 3 && action == &Action::Click
     ));
     assert!(matches!(
-        &sent[6],
+        &sent[7],
         AgentMessage::TaskComplete { success, summary }
             if *success && summary == "已在百度搜索天气"
     ));