重构: 后端 df-ai/commands 拆分+df-nodes/workflow 改造+P0 bug 修复

- df-ai: context 历史中毒三档自愈 sanitize_messages(AC3)+anthropic_compat tool_use_id None 跳过(AC1/AC2)+删 router/stream 死码
- df-core: events 加 select_type+decisions 多选审批契约(F-260615-01)
- df-execute: shell run_command 工具复用(F-260615-05)
- df-nodes: human_node 多选校验+2 端到端测(F-01)+取消跳 set_failed(B-03b-R1/R2/R8)
- df-workflow: executor/dag/state cancel 闭环(B-06/07/03a/b)+provider approve options(R-PD-5)
- df-storage: find_path_conflict 抽公共(R-PD-11)+COLS 常量断言
- df-ideas: 删 IdeaPromoter/PromotionPolicy 死码(R-PD-14)
- src-tauri/commands/ai: secret keyring 迁移(FR-S1/R-PD-4)+GeneratingGuard RAII+disarm(B-09/26)+newConversation 软复位(B-10)+stream 心跳/stop select/空回复判错(B-02/04/05/15)+run_command(F-05)+mask audit(AR-3)
- src-tauri/commands/{project,task,workflow,mod,lib,state}: task detail IPC(F-02)+approve decisions+task list 联动(B-29)
- Cargo.lock+Cargo.toml 依赖同步

crates/df-workflow/src/registry.rs

@@ -42,14 +42,23 @@ impl NodeRegistry {
     pub fn build_dag(&self, def: &DagDef) -> anyhow::Result<Dag> {
         let mut dag = Dag::new();
 
-        // 创建所有节点实例
+        // 创建所有节点实例，同时收集节点 ID 集合用于边校验
+        let mut node_ids: std::collections::HashSet<&String> = std::collections::HashSet::new();
         for (id, node_def) in &def.nodes {
             let node = self.create(&node_def.node_type, &node_def.config)?;
             dag.add_node(id.clone(), node);
+            node_ids.insert(id);
         }
 
-        // 添加所有边
+        // 添加所有边 — 校验两端节点均存在，野边早返回
         for edge_def in &def.edges {
+            if !node_ids.contains(&edge_def.source) || !node_ids.contains(&edge_def.target) {
+                anyhow::bail!(
+                    "边 source/target 节点不存在: {} -> {}",
+                    edge_def.source,
+                    edge_def.target
+                );
+            }
             match &edge_def.condition {
                 Some(cond) => dag.add_edge_with_condition(
                     edge_def.source.clone(),
@@ -62,16 +71,6 @@ impl NodeRegistry {
 
         Ok(dag)
     }
-
-    /// 检查是否已注册指定类型
-    pub fn is_registered(&self, type_name: &str) -> bool {
-        self.factories.contains_key(type_name)
-    }
-
-    /// 列出所有已注册的节点类型
-    pub fn registered_types(&self) -> Vec<&str> {
-        self.factories.keys().map(|s| s.as_str()).collect()
-    }
 }
 
 // 不实现 Default:原 Default 注册了一个会 panic 的 script 工厂(unimplemented!),