fix(devti): handle empty plan items and add custom engine settings

- Update PlanLangSketch to handle empty plan items by clearing the content panel
- Add new settings for custom engine configuration: - Delay seconds
  - Custom response format
  - Custom response type  - Custom request body format - Custom request header format
- Update both English and Chinese properties files with new setting labels

Author: phodal

core/src/main/kotlin/cc/unitmesh/devti/sketch/ui/plan/PlanLangSketch.kt

@@ -41,7 +41,12 @@ class PlanController(
     }
 
     fun updatePlan(newPlanItems: List<AgentTaskEntry>) {
-        if (newPlanItems.isEmpty()) return
+        if (newPlanItems.isEmpty()) {
+            contentPanel.removeAll()
+            contentPanel.revalidate()
+            contentPanel.repaint()
+            return
+        }
 
         val taskStateMap = mutableMapOf<String, Pair<Boolean, TaskStatus>>()
         agentTaskItems.forEach { planItem ->

core/src/main/resources/messages/AutoDevBundle_en.properties

@@ -44,6 +44,11 @@ settings.maxTokenLengthParam=Max token length
 settings.customEngineServerParam=LLM Server Address
 settings.customModelParam=Model Name
 settings.customEngineTokenParam=LLM API Key/Token
+settings.delaySecondsParam=Quest Delay Seconds
+settings.customEngineResponseFormatParam=Custom Response Format (Json Path)
+settings.customEngineResponseTypeParam=Custom Response Type
+settings.customEngineRequestBodyFormatParam=Custom Request Body Format (Json)
+settings.customEngineRequestHeaderFormatParam=Custom Request Header Format (Json)
 
 customize.title=Custom Agent
 counit.agent.enable.label=Enable custom agent (experimental)

core/src/main/resources/messages/AutoDevBundle_zh.properties

@@ -42,7 +42,11 @@ settings.maxTokenLengthParam=最大 token 长度
 settings.customEngineServerParam=LLM 服务器 URL
 settings.customModelParam=模型名称
 settings.customEngineTokenParam=LLM 服务器密钥
-
+settings.delaySecondsParam=请求延迟秒数（可选）
+settings.customEngineResponseFormatParam=自定义响应格式（Json 路径）
+settings.customEngineResponseTypeParam=自定义响应类型
+settings.customEngineRequestBodyFormatParam=自定义请求主体格式（Json）
+settings.customEngineRequestHeaderFormatParam=自定义请求头格式（Json）
 
 customize.title=自定义智能体
 counit.agent.enable.label=启用自定义智能体（实验性）