fix(downloads): humanized reasons and TechInfo on the download panel (DL-2b)

- board organize hint uses DEAI-2 reasonLine; add transfer_failed, blocked,
  blocked_by_conflict, main_failed, not_imported_kind, target_root_not_managed,
  download_removed to the reason table with tests
- download detail / plans tab: internal ids, raw codes and JSON moved into TechInfo
- library versions tech block switched to TechInfo (TODO(DEAI-2))
- copy: glossary terms (no 接管/候选), plan reason codes no longer shown raw

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

apps/web/app/lib/labels.ts

@@ -1,4 +1,6 @@
+import { looksLikeCode } from "@umt/contracts";
 import type { StatusTone } from "~/components/console/status-badge.tsx";
+import { reasonLine } from "~/lib/reasons.ts";
 
 // 状态值 → 中文文案 + 语气。状态徽章必须带文字,这里集中维护常用的几组。
 
@@ -154,5 +156,9 @@ const PLAN_REASON: Record<string, string> = {
   "organize:succeeded": "整理成功",
   "organize:partial": "部分整理成功",
   "organize:failed": "整理失败",
+  authorized: "已批准",
+  "reserved:agent": "智能体已预留空间",
 };
-export const planReasonText = (v: string | null | undefined) => (v ? (PLAN_REASON[v] ?? v) : null);
+/** 不认识的内部码走原因码表,仍不认识就不显示(原码在技术信息里) */
+export const planReasonText = (v: string | null | undefined) =>
+  v ? (PLAN_REASON[v] ?? (looksLikeCode(v) ? reasonLine(v, "") || null : v)) : null;