fix: replace raw codes and internal IDs in the console with Chinese labels

Found in v0.2 visual QA (docs/plan/09-visual-qa.md):
- actor strings (admin_session:<uuid>, user:<uuid>, system) -> 管理员/系统/API Key
  in policy revisions, subscriptions, inbox, trash, business tasks, organize detail
- cache volume without key shows the downloader name instead of instance:<uuid>
- download timeline/plan: task and organize statuses, plan purpose, priority and
  status reason localized; audit gets labels for capability/files/site/feed actions
- organize record reason uses conflict detail (没有可入库的主视频) instead of
  blocked:no_main_video; slot/candidate reasons drop inflight:<uuid>
- identity decision summary no longer shows no_viable_candidate
- upstream test: 'Connection error.' classified as network, with a Chinese hint
- new policy draft prefills key default (placeholder looked like a value)
- dialog/sheet close sr-only text in Chinese

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

apps/web/app/components/downloads/download-detail.tsx

@@ -20,10 +20,13 @@ import { StatusBadge } from "~/components/console/status-badge.tsx";
 import { Button } from "~/components/ui/button.tsx";
 import { relTime } from "~/components/workbench/release-fields.ts";
 import { errorMessage } from "~/lib/api.ts";
+import { planReasonText } from "~/lib/labels.ts";
 import { formatBytes, formatDateTime } from "~/lib/utils.ts";
 import { BusinessTimeline } from "./business-timeline.tsx";
 import { OrganizeDialog } from "./organize-dialog.tsx";
 
+const PLAN_PURPOSE_LABEL: Record<string, string> = { fill: "补缺", upgrade: "升级", replace_source: "换源" };
+
 /** 进度:细线 + 文字;总量未知时不伪造百分比 */
 export function ProgressLine({ t }: { t: DownloadTask }) {
   const known = t.sizeBytes !== null;
@@ -166,9 +169,9 @@ export function DownloadDetail({ task }: { task: DownloadTask }) {
           <KvList
             items={[
               { label: "状态", value: PLAN_STATUS_LABEL[plan.data.status] },
-              { label: "用途", value: plan.data.purpose },
+              { label: "用途", value: PLAN_PURPOSE_LABEL[plan.data.purpose] ?? plan.data.purpose },
               { label: "预留空间", value: formatBytes(plan.data.reservedBytes, 1) },
-              { label: "说明", value: plan.data.statusReason, wide: true },
+              { label: "说明", value: planReasonText(plan.data.statusReason), wide: true },
             ]}
           />
           <JsonView className="mt-2" label="评估依据" value={plan.data.evaluation} />