fix(agent,claw402): harden agent runtime and strip max_tokens for thinking models

- Fix Stop() race condition using sync.Once
- Add ensureHistory() to prevent nil panic in planner/dispatcher
- Add bounds check on trader ID slicing
- Log saveExecutionState and clearSetupState errors instead of discarding
- Remove always-true modelID condition in onboard setup
- Add Chinese setup keywords and expand model name aliases
- Strip max_tokens from claw402 requests to avoid thinking-model budget exhaustion
- Hide Agent nav tab (Beta) pending merge to main
- Sync tests with code changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

agent/onboard_test.go

@@ -9,12 +9,13 @@ func TestIsDirectSetupCommand(t *testing.T) {
 	}{
 		{text: "setup", want: true},
 		{text: "/setup", want: true},
-		{text: "开始配置", want: false},
+		{text: "开始配置", want: true},
+		{text: "配置", want: true},
+		{text: "开始设置", want: true},
 		{text: "/开始配置", want: false},
 		{text: "创建全新的配置，杠杆你定", want: false},
 		{text: "帮我配置一个 deepseek 模型", want: false},
 		{text: "绑定交易所 okx", want: false},
-		{text: "配置", want: false},
 	}
 
 	for _, tc := range cases {