重构: audit第四批data_change收尾(strategy)

- 新建 audit/data_change.rs(50行 data_change_for_tool/emit_data_changed), audit/mod.rs 451→416(-35)
- pub(crate) re-export emit_data_changed(chat.rs super::super::audit + process_tool_calls裸名路径透明)
- F-09 per_conv保留(本批未触session/conv_id逻辑)
主代grep核验(不cargo避openai-split df-ai中间态): mod data_change/pub(crate)use + data_change.rs fn印证; agent隔离自验cargo 0+test 98
strategy: 单批1-2文件原子; audit/mod.rs余416(process_tool_calls主逻辑+build_write_file_diff/risk/truncate helper); audit四批拆分接近完成
git add指定(audit/*)

src-tauri/src/commands/ai/audit/data_change.rs

@@ -0,0 +1,50 @@
+//! AR-11（方案A）：数据变更联动刷新。
+//!
+//! 工具执行成功后按映射 emit "df-data-changed" { entity, action }，
+//! 前端 store listen 该事件按 entity 调 loadProjects/loadTasks/loadIdeas 刷新列表，
+//! 取代工具执行后需手动刷新。
+//!
+//! 第四批从 audit/mod.rs 抽离,行为零变更。
+
+use tauri::{AppHandle, Emitter};
+
+/// AR-11（方案A）：工具名 → (entity, action) 映射，用于数据变更联动刷新。
+///
+/// 仅数据变更类工具返回 Some，其余工具返回 None（不 emit df-data-changed）。
+/// 映射规则：
+/// - create_project/create_idea/create_task → (project/idea/task, create)
+/// - update_project/update_task/update_idea → (..., update)
+/// - delete_project/delete_task/delete_idea/purge_project → (..., delete)
+/// - restore_project → (project, update)（恢复等同状态变更，前端走 update 刷新）
+/// - bind_directory → (project, update)（绑定目录属项目字段更新）
+pub(super) fn data_change_for_tool(name: &str) -> Option<(&'static str, &'static str)> {
+    let (entity, action) = match name {
+        "create_project" => ("project", "create"),
+        "create_task" => ("task", "create"),
+        "create_idea" => ("idea", "create"),
+        "update_project" => ("project", "update"),
+        "update_task" => ("task", "update"),
+        "update_idea" => ("idea", "update"),
+        "delete_project" | "purge_project" => ("project", "delete"),
+        "delete_task" => ("task", "delete"),
+        "delete_idea" => ("idea", "delete"),
+        "restore_project" => ("project", "update"),
+        "bind_directory" => ("project", "update"),
+        _ => return None,
+    };
+    Some((entity, action))
+}
+
+/// AR-11（方案A）：工具执行成功后按映射 emit "df-data-changed" { entity, action }。
+///
+/// 前端 store listen 该事件，按 entity 调 loadProjects/loadTasks/loadIdeas 刷新列表，
+/// 取代工具执行后需手动刷新。仅工具名命中 data_change_for_tool 映射才 emit，
+/// 其余工具（run_workflow/list_tasks 等）不 emit。emit 失败不阻断（let _ =）。
+pub(crate) fn emit_data_changed(app_handle: &AppHandle, tool_name: &str) {
+    if let Some((entity, action)) = data_change_for_tool(tool_name) {
+        let _ = app_handle.emit(
+            "df-data-changed",
+            serde_json::json!({ "entity": entity, "action": action }),
+        );
+    }
+}