feat(downloads): fold download plans into download panel (DL-3)

- Waiting plans (approval / disk space / automation off / queued) are
  active-segment rows on /download-tasks/board, merged by created_at,
  counted, with approve / cancel actions; ?plan= deep links and legacy
  /downloads/plans routes redirect to the panel
- Download detail shows "why this download" (source, purpose, replaced
  version, reasons); raw evaluation in tech info
- Failed / cancelled / expired plans appear in the entity download
  history; rejected / revoked / expired approvals close draft plans
- New GET /acquisition-plans/{id}/why, POST /acquisition-plans/{id}/cancel
- User-facing copy no longer says 下载计划; glossary updated

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/workbench/download-dialog.tsx

@@ -19,7 +19,7 @@ import { errorMessage } from "~/lib/api.ts";
 import { formatBytes } from "~/lib/utils.ts";
 
 const STEPS = [
-  "生成下载计划，预留收录版本和预算；每个收录版本同时只有一个在途计划",
+  "预留收录版本和预算；每个收录版本同时只有一个在途的下载",
   "已有相同资源或相同 hash 的任务时直接接管，不重复提交",
   "缓存卷超过硬阈值或读不到磁盘状态时无法提交",
   "提交前复核免费、做种等易变字段",
@@ -56,10 +56,10 @@ export function DownloadDialog({
           if (r.submitted && r.plan) {
             setRejected(null);
             setDone(r.plan.id);
-            toast.success(`已提交${slotName(r.slotId) ? `(${slotName(r.slotId)})` : ""}，进度见「下载队列」`);
+            toast.success(`已提交${slotName(r.slotId) ? `(${slotName(r.slotId)})` : ""}，进度见「下载面板」`);
           } else {
             setRejected(r.rejected);
-            toast.warning("没有生成下载计划");
+            toast.warning("没有下载");
           }
         },
         onError: (e) => toast.error(errorMessage(e)),
@@ -109,7 +109,7 @@ export function DownloadDialog({
         )}
         {rejected ? (
           <div className="rounded-xl border border-warning/40 bg-warning/10 px-3 py-2.5 text-caption text-warning">
-            <p className="mb-1">没有生成下载计划：</p>
+            <p className="mb-1">没有下载：</p>
             <ul className="list-disc space-y-0.5 pl-5">
               {rejected.map((r, i) => (
                 <li key={`${r.slotId}-${r.code}-${i}`} className="break-words">
@@ -122,8 +122,8 @@ export function DownloadDialog({
         ) : null}
         {done ? (
           <p className="text-caption text-success">
-            计划已生成。
-            <Link to="/console/downloads/plans" className="underline underline-offset-4">
+            已加入下载。
+            <Link to={`/console/downloads?plan=${done}`} className="underline underline-offset-4">
               查看
             </Link>
           </p>