refactor(runner): add policy listener registering function and support registering McpConfigWatcher after starting

Partner-Core/src/main/java/work/slhaf/partner/core/action/runner/LocalRunnerClient.java

@@ -95,6 +95,7 @@ public class LocalRunnerClient extends RunnerClient implements AutoCloseable {
                     executor
             );
             configWatcher.start();
+            configWatcher.registerPolicyListener();
         } catch (Exception e) {
             closeQuietly(configWatcher);
             closeQuietly(dynamicManager);

Partner-Core/src/main/java/work/slhaf/partner/core/action/runner/policy/ExecutionPolicy.kt

@@ -112,4 +112,8 @@ abstract class PolicyProvider(
 
 interface RunnerExecutionPolicyListener {
     fun onPolicyChanged(policy: ExecutionPolicy)
+
+    fun registerPolicyListener() {
+        ExecutionPolicyRegistry.addListener(this)
+    }
 }