refactor(ext-harmonyos): remove unused imports and log statement

The HarmonyOS extension has been updated to remove unused imports and a log statement from the `HarmonyOSChatContextProvider` class, simplifying the code and reducing the risk of potential issues caused by unnecessary logging.

Author: phodal

exts/ext-harmonyos/src/main/kotlin/cc/unitmesh/harmonyos/actions/auto/ArkUiExample.kt

@@ -3,12 +3,9 @@ package cc.unitmesh.harmonyos.provider
 import cc.unitmesh.devti.provider.context.ChatContextItem
 import cc.unitmesh.devti.provider.context.ChatContextProvider
 import cc.unitmesh.devti.provider.context.ChatCreationContext
-import com.intellij.openapi.diagnostic.logger
 import com.intellij.openapi.project.Project
 
 class HarmonyOSChatContextProvider : ChatContextProvider {
-    private val logger = logger<HarmonyOSChatContextProvider>()
-
     override fun isApplicable(project: Project, creationContext: ChatCreationContext): Boolean {
         return System.getProperty("idea.platform.prefix", "idea") == "DevEcoStudio"
     }