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/subscriptions/coverage-matrix.tsx

@@ -195,7 +195,7 @@ export function CoverageMatrix({
   );
 }
 
-/** 点格打开:资产 / 质量 / pri / 计划 / 原因 / 可升级 / 延后 → 手动补全、跳下载计划 */
+/** 点格打开:资产 / 质量 / pri / 计划 / 原因 / 可升级 / 延后 → 手动补全、跳下载面板 */
 export function CellSheet({
   sel,
   subscriptionId,
@@ -244,9 +244,9 @@ export function CellSheet({
           <>
             {c.planId ? (
               <Button asChild variant="outline">
-                <Link to={`${consolePath("downloads", "plans")}?plan=${c.planId}`}>
+                <Link to={`${consolePath("downloads")}?plan=${c.planId}`}>
                   <Download />
-                  下载计划
+                  查看下载
                 </Link>
               </Button>
             ) : null}
@@ -300,7 +300,7 @@ export function CellSheet({
                   ) : null,
                 },
                 {
-                  label: "下载计划",
+                  label: "下载",
                   value: c.planId
                     ? `${PLAN_STAGE[c.planStage ?? ""] ?? c.planStage ?? "在途"} · ${c.planId.slice(0, 8)}`
                     : null,