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-core/src/events.rs

@@ -4,12 +4,31 @@ use serde::{Deserialize, Serialize};
 
 use crate::types::NodeId;
 
+/// 人工审批选择类型(F-260615-01)
+/// - Single: 单选(decision 单值),缺省值,向后兼容现有调用方
+/// - Multiple: 多选(decisions 数组)
+///
+/// serde rename_all="snake_case" → "single"/"multiple"
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "snake_case")]
+pub enum SelectType {
+    #[default]
+    Single,
+    Multiple,
+}
+
 /// 人工审批响应
+///
+/// 兼容字段(decision 单值):仅 select_type=Single 时使用;
+/// 新字段 decisions 数组:Single 时长度=1,Multiple 时长度≥1。
+/// 旧调用方仍可只填 decision,HumanNode 下游兼容两者。
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct HumanApprovalResponse {
     pub execution_id: String,
     pub node_id: NodeId,
     pub decision: String,
+    #[serde(default)]
+    pub decisions: Vec<String>,
     pub comment: Option<String>,
 }
 
@@ -63,12 +82,18 @@ pub enum WorkflowEvent {
         title: String,
         description: String,
         options: Vec<String>,
+        /// F-260615-01: 选择类型,缺省 Single(向后兼容)
+        #[serde(default)]
+        select_type: SelectType,
     },
     /// 人工审批响应
     HumanApprovalResponse {
         execution_id: String,
         node_id: NodeId,
         decision: String,
+        /// F-260615-01: 多选结果(Single 模式长度=1,Multiple 模式长度≥1)
+        #[serde(default)]
+        decisions: Vec<String>,
         comment: Option<String>,
     },
 }