重构: tool_registry拆分及多批改进

crates/df-workflow/Cargo.toml

@@ -10,6 +10,5 @@ serde_json = { workspace = true }
 tokio = { workspace = true }
 async-trait = { workspace = true }
 futures = "0.3"
-thiserror = { workspace = true }
 anyhow = { workspace = true }
 tracing = { workspace = true }

crates/df-workflow/src/eventbus.rs

@@ -1,7 +1,6 @@
 //! 事件总线 — 基于 tokio::sync::broadcast 的发布/订阅
 
 use tokio::sync::broadcast;
-use tokio::sync::broadcast::error::SendError;
 use df_types::events::WorkflowEvent;
 
 /// 事件总线
@@ -39,11 +38,6 @@ impl EventBus {
     pub fn subscribe(&self) -> EventSubscriber {
         self.sender.subscribe()
     }
-
-    /// 发送人工审批请求
-    pub fn emit_human_approval_request(&self, event: WorkflowEvent) -> Result<usize, SendError<WorkflowEvent>> {
-        self.sender.send(event)
-    }
 }
 
 impl Default for EventBus {