feat(web): unified task stream with plan tab, task detail drawer and audit links (FE-1)

Tasks page merges engine runs (with W9-I business fields) into one stream:
all / active / failed / plan tabs, filters for source, business kind, status
and time; detail drawer with business summary, timeline, collapsed engine
steps, cancel/retry and related audit links. The schedule board moves into
the plan tab; card history jumps to the stream filtered by schedule key.

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

apps/web/app/components/downloads/business-tasks.tsx

@@ -328,7 +328,7 @@ export function TaskSummary({ t }: { t: Task }) {
             {
               label: "引擎运行",
               value: t.engineRunId ? (
-                <Link to={consolePath("engine", t.engineRunId)} className="font-mono underline underline-offset-4">
+                <Link to={consolePath("tasks", t.engineRunId)} className="font-mono underline underline-offset-4">
                   {t.engineRunId.slice(0, 12)}
                 </Link>
               ) : null,