fix(build): 移除 agent_cli.go 中不存在的 ReasoningEnabled 字段引用

commit 3b19ae6 (ssh-key 转圈修复) 意外引入 ReasoningEnabled 引用,
但 llm.Config 和 model.LLMConfig 均无此字段导致 go build 编译失败。
移除该行恢复正常编译。

backend/controller/agent_cli.go

@@ -182,11 +182,10 @@ func (ac *agentConn) startTask(sshCfg remoteexec.SSHConfig, llmCfg model.LLMConf
 	// 构建引擎
 	engine, err := agentcli.NewEngine(agentcli.EngineConfig{
 		LLM: llm.Config{
-			Protocol:         resolveProtocol(llmCfg.Provider),
-			Endpoint:         resolveEndpoint(llmCfg.Provider, llmCfg.Endpoint),
-			APIKey:           llmCfg.APIKey, Model: llmCfg.Model,
-			Temperature:      llmCfg.Temperature, MaxTokens: llmCfg.MaxTokens,
-			ReasoningEnabled: llmCfg.ReasoningEnabled,
+			Protocol:    resolveProtocol(llmCfg.Provider),
+			Endpoint:    resolveEndpoint(llmCfg.Provider, llmCfg.Endpoint),
+			APIKey:      llmCfg.APIKey, Model: llmCfg.Model,
+			Temperature: llmCfg.Temperature, MaxTokens: llmCfg.MaxTokens,
 		},
 		SSH:        sshCfg,
 		SafetyMode: safety.ModeBalanced,