refactor: 统一项目名称从OpenFang到ZCLAW

重构所有代码和文档中的项目名称，将OpenFang统一更新为ZCLAW。包括：
- 配置文件中的项目名称
- 代码注释和文档引用
- 环境变量和路径
- 类型定义和接口名称
- 测试用例和模拟数据

同时优化部分代码结构，移除未使用的模块，并更新相关依赖项。

crates/zclaw-pipeline/src/engine/stage.rs

@@ -10,11 +10,9 @@
 use std::collections::HashMap;
 use std::sync::Arc;
 use async_trait::async_trait;
-use futures::future::join_all;
 use serde_json::{Value, json};
-use tokio::sync::RwLock;
 
-use crate::types_v2::{Stage, ConditionalBranch, PresentationType};
+use crate::types_v2::{Stage, ConditionalBranch};
 use crate::engine::context::{ExecutionContextV2, ContextError};
 
 /// Stage execution result
@@ -242,14 +240,6 @@ impl StageEngine {
                 Ok(result)
             }
             Err(e) => {
-                let result = StageResult {
-                    stage_id: stage_id.clone(),
-                    output: Value::Null,
-                    status: StageStatus::Failed,
-                    error: Some(e.to_string()),
-                    duration_ms,
-                };
-
                 self.emit_event(StageEvent::Error {
                     stage_id,
                     error: e.to_string(),
@@ -312,7 +302,7 @@ impl StageEngine {
         stage_id: &str,
         each: &str,
         stage_template: &Stage,
-        max_workers: usize,
+        _max_workers: usize,
         context: &mut ExecutionContextV2,
     ) -> Result<Value, StageError> {
         // Resolve the array to iterate over
@@ -419,7 +409,7 @@ impl StageEngine {
     /// Execute compose stage
     async fn execute_compose(
         &self,
-        stage_id: &str,
+        _stage_id: &str,
         template: &str,
         context: &ExecutionContextV2,
     ) -> Result<Value, StageError> {
@@ -568,7 +558,8 @@ impl StageEngine {
         Ok(resolved_value)
     }
 
-    /// Clone with drivers
+    /// Clone with drivers (reserved for future use)
+    #[allow(dead_code)]
     fn clone_with_drivers(&self) -> Self {
         Self {
             llm_driver: self.llm_driver.clone(),