feat(behavior-tree): add action() and condition() methods to BehaviorTreeBuilder (#408)

- Add action(implementationType, name?, config?) for custom action executors
- Add condition(implementationType, name?, config?) for custom condition executors
- Update documentation (EN and CN) with usage examples
- Add test script to package.json

.changeset/behavior-tree-builder-action.md

@@ -0,0 +1,35 @@
+---
+"@esengine/behavior-tree": minor
+---
+
+feat: add action() and condition() methods to BehaviorTreeBuilder
+
+Added new methods to support custom executor types directly in the builder:
+
+- `action(implementationType, name?, config?)` - Use custom action executors registered via `@NodeExecutorMetadata`
+- `condition(implementationType, name?, config?)` - Use custom condition executors
+
+This provides a cleaner API for using custom node executors compared to the existing `executeAction()` which only supports blackboard functions.
+
+Example:
+```typescript
+// Define custom executor
+@NodeExecutorMetadata({
+    implementationType: 'AttackAction',
+    nodeType: NodeType.Action,
+    displayName: 'Attack',
+    category: 'Combat'
+})
+class AttackAction implements INodeExecutor {
+    execute(context: NodeExecutionContext): TaskStatus {
+        return TaskStatus.Success;
+    }
+}
+
+// Use in builder
+const tree = BehaviorTreeBuilder.create('AI')
+    .selector('Root')
+        .action('AttackAction', 'Attack', { damage: 50 })
+    .end()
+    .build();
+```