refactor(prompt): simplify DevIn processor access

Replace repetitive `LanguagePromptProcessor.instance("DevIn").firstOrNull()` calls with a dedicated `devin()` method for cleaner and more consistent access to the DevIn processor.

Author: phodal

core/src/main/kotlin/cc/unitmesh/devti/agent/CustomAgentChatProcessor.kt

@@ -147,9 +147,8 @@ class CustomAgentChatProcessor(val project: Project) {
         }
 
         if (!devInCode.isNullOrEmpty()) {
-            LanguagePromptProcessor.instance("DevIn").forEach {
-                it.execute(project, CustomAgentContext(selectedAgent, devInCode!!))
-            }
+            val devin = LanguagePromptProcessor.devin()
+            devin?.execute(project, CustomAgentContext(selectedAgent, devInCode!!))
         }
 
         return llmResponse

core/src/main/kotlin/cc/unitmesh/devti/gui/chat/ChatCodingPanel.kt

@@ -114,7 +114,7 @@ class ChatCodingPanel(private val chatCodingService: ChatCodingService, val disp
 
                 val context = ChatContext(null, "", "")
 
-                val postProcessors = LanguagePromptProcessor.instance("DevIn").firstOrNull()
+                val postProcessors = LanguagePromptProcessor.devin()
                 if (postProcessors != null) {
                     prompt = postProcessors.compile(chatCodingService.project, prompt)
                 }

core/src/main/kotlin/cc/unitmesh/devti/prompting/SimpleDevinPrompter.kt

@@ -32,7 +32,7 @@ abstract class SimpleDevinPrompter {
         }
 
         /// handle with DevIn language
-        val postProcessors = LanguagePromptProcessor.instance("DevIn").firstOrNull()
+        val postProcessors = LanguagePromptProcessor.devin()
         val compiledTemplate = postProcessors?.compile(project, template) ?: template
 
         variableCompile.set("input", userInput)

core/src/main/kotlin/cc/unitmesh/devti/provider/devins/LanguagePromptProcessor.kt

@@ -26,8 +26,12 @@ interface LanguagePromptProcessor {
     companion object {
         val EP_NAME = ExtensionPointName<LanguagePromptProcessor>("cc.unitmesh.languageProcessor")
 
-        fun instance(languageName: String): List<LanguagePromptProcessor> {
+        private fun instance(languageName: String): List<LanguagePromptProcessor> {
             return EP_NAME.extensionList.filter { it.name == languageName }
         }
+
+        fun devin(): LanguagePromptProcessor? {
+            return instance("DevIn").firstOrNull()
+        }
     }
 }

core/src/main/kotlin/cc/unitmesh/devti/sketch/SketchInputListener.kt

@@ -52,7 +52,7 @@ class SketchInputListener(
     }
 
     override fun manualSend(userInput: String) {
-        val postProcessors = LanguagePromptProcessor.instance("DevIn").firstOrNull()
+        val postProcessors = LanguagePromptProcessor.devin()
         val compiledInput = runReadAction { postProcessors?.compile(project, userInput) } ?: userInput
 
         toolWindow.addRequestPrompt(compiledInput)

core/src/main/kotlin/cc/unitmesh/devti/sketch/SketchRunContext.kt

@@ -23,6 +23,10 @@ import com.intellij.psi.PsiManager
 import kotlinx.coroutines.runBlocking
 import java.text.SimpleDateFormat
 
+/**
+ * provide context for [core/src/main/resources/genius/zh/code/sketch.vm]
+ * make sure the context is serializable and keep same with the template
+ */
 data class SketchRunContext(
     val currentFile: String?,
     val currentElement: PsiElement? = null,