refactor(core): remove unused observers and update project rule

- Remove ChangeListObserver from autodev-core.xml- Delete ChangeListObserver class
- Update ProjectRule to use dynamic rule path
- Remove unused TechStack and CodePromptText classes
- Remove unused AgentTaskEntry enum class

Author: phodal

core/src/223/main/resources/META-INF/autodev-core.xml

@@ -266,7 +266,6 @@
         <agentObserver implementation="cc.unitmesh.devti.observer.TestAgentObserver" />
         <agentObserver implementation="cc.unitmesh.devti.observer.BuiltTaskAgentObserver" />
         <agentObserver implementation="cc.unitmesh.devti.observer.AddDependencyAgentObserver" />
-<!--        <agentObserver implementation="cc.unitmesh.devti.observer.ChangeListObserver" />-->
     </extensions>
 
     <actions>

core/src/233/main/resources/META-INF/autodev-core.xml

@@ -268,7 +268,6 @@
         <agentObserver implementation="cc.unitmesh.devti.observer.TestAgentObserver" />
         <agentObserver implementation="cc.unitmesh.devti.observer.BuiltTaskAgentObserver" />
         <agentObserver implementation="cc.unitmesh.devti.observer.AddDependencyAgentObserver" />
-<!--        <agentObserver implementation="cc.unitmesh.devti.observer.ChangeListObserver" />-->
     </extensions>
 
     <actions>

core/src/main/kotlin/cc/unitmesh/devti/observer/ChangeListObserver.kt

@@ -2,9 +2,6 @@ package cc.unitmesh.devti.observer.plan
 
 import kotlinx.serialization.Serializable
 
-/**
- * 表示PDCA循环中的阶段
- */
 @Serializable
 enum class PlanPhase {
     PLAN,   // 计划阶段

core/src/main/kotlin/cc/unitmesh/devti/observer/plan/AgentTaskEntry.kt

@@ -1,8 +1,5 @@
 package cc.unitmesh.devti.prompting.code
 
-/**
- * TODO: change to dependency tree
- */
 data class TechStack(
     val coreFrameworks: MutableMap<String, Boolean> = mutableMapOf(),
     val testFrameworks: MutableMap<String, Boolean> = mutableMapOf(),

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

@@ -1,6 +1,7 @@
 package cc.unitmesh.devti.sketch.rule
 
 import cc.unitmesh.devti.bridge.knowledge.lookupFile
+import cc.unitmesh.devti.settings.coder.coderSetting
 import cc.unitmesh.devti.sketch.ui.patch.readText
 import com.intellij.openapi.components.Service
 import com.intellij.openapi.project.Project
@@ -9,9 +10,7 @@ import com.intellij.openapi.vfs.VirtualFile
 
 @Service(Service.Level.PROJECT)
 class ProjectRule(private val project: Project) {
-    companion object {
-        const val RULE_PATH = "prompts/rules"
-    }
+    val RULE_PATH = project.coderSetting.state.teamPromptsDir + "/" + "rules"
 
     /**
      * Get rule content by filename