修复: df-mcp evaluate_idea 写回失败感知 + list_trash DB 错误感知(CR-11 ⚪2)

CR-260619-11 审查 ⚪2 可选改进(MCP 对外场景,非阻塞):
- evaluate_idea: 写回 scores 失败返 err(原 let _ 丢弃)+ 响应用写回后 rec(原 idea 旧版本)
- list_trash: DB 错误返 err(原 unwrap_or_default 吞错误返空列表对外误导)
df-mcp 8 passed 无回归

crates/df-mcp/src/tools.rs

@@ -613,8 +613,10 @@ fn evaluate_idea(ctx: &Ctx, args: Value) -> BoxFuture<'static, CallToolResult> {
         let mut rec = idea.clone();
         rec.scores = Some(serde_json::to_string(&scores).unwrap_or_default());
         rec.updated_at = now;
-        let _ = repo.update_full(&rec).await;
+        if let Err(e) = repo.update_full(&rec).await {
-        json_ok(json!({ "id": id, "idea": idea, "scores": scores }))
+            return err_str(e);
+        }
+        json_ok(json!({ "id": id, "idea": rec, "scores": scores }))
     })
 }
 
@@ -661,8 +663,14 @@ fn run_workflow(_ctx: &Ctx, _args: Value) -> BoxFuture<'static, CallToolResult>
 fn list_trash(ctx: &Ctx, _args: Value) -> BoxFuture<'static, CallToolResult> {
     let db = ctx.db.clone();
     Box::pin(async move {
-        let projects = ProjectRepo::new(&db).list_deleted().await.unwrap_or_default();
+        let projects = match ProjectRepo::new(&db).list_deleted().await {
-        let tasks = TaskRepo::new(&db).list_deleted().await.unwrap_or_default();
+            Ok(v) => v,
+            Err(e) => return err_str(e),
+        };
+        let tasks = match TaskRepo::new(&db).list_deleted().await {
+            Ok(v) => v,
+            Err(e) => return err_str(e),
+        };
         json_ok(json!({
             "projects": projects,
             "tasks": tasks,