feat(web): 设置页按新分类重排,加搜索、缓存分区与旧锚点跳转

- 左栏三组分区 + 当前分区的节;窄屏为搜索框、分组下拉和节的横排胶囊
- 搜索框按分区、节、节别名和字段名定位,选中字段时滚到该字段并聚焦
- 旧 hash(#automation/cache、#api-keys、#library/scrape 等)replace 到新位置
- 下载器分区放下载盘水位与保种缺省值,名字与实例抽屉统一(暂停线 / 恢复线 / 保种天数)
- 新增获取、整理与刮削、系统、缓存分区;API Key 并入账户与安全,快捷键移到界面
- 补上缺的入口:最小视频体积、子会话并发与层数、搜索站点;日志保留天数(已废弃)不再显示
- 缓存分区按区列出条数、占用、最近写入,单区清空二次确认;TMDB 与图片缓存并入
- 保存提示统一为「已保存「节名」」;按入库口径把相关文案改成「整理」

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cxwgnn2pbzQ7rXv3rq7fei

apps/web/app/components/settings/instances.tsx

@@ -82,15 +82,7 @@ function authKindOf(r: DownloaderInstance): string {
   return r.username ? "password" : r.secretRef ? "api_key" : "none";
 }
 
-export function DownloadersSection() {
-  return (
-    <SettingsBlock section="downloaders" anchor="instances" title="qBittorrent 实例" plain>
-      <DownloadersTable />
-    </SettingsBlock>
-  );
-}
-
-/** 下载器自己的水位 / 保种(settings.policy):表单里是字符串,空 = 用全局 */
+/** 下载器自己的水位 / 保种(settings.policy):表单里是字符串,空 = 用「下载器」分区的缺省值 */
 const POLICY_FIELDS = [
   ["hardPct", "hardThresholdPercent"],
   ["resumePct", "resumePercent"],
@@ -114,7 +106,7 @@ function policyBody(v: FormValues): Record<string, number | boolean> {
   return out;
 }
 
-function DownloadersTable() {
+export function DownloadersTable() {
   const list = downloaders.useList();
   const create = downloaders.useCreate();
   const update = downloaders.useUpdate();
@@ -192,19 +184,19 @@ function DownloadersTable() {
           { name: "cacheVolumeKey", label: "缓存卷标识", kind: "text", placeholder: "cache-1" },
           {
             name: "hardPct",
-            label: "硬阈值（%）",
+            label: "暂停线（%）",
             kind: "number",
-            placeholder: "留空用全局",
-            hint: "这个下载器的缓存盘用到多少就停止新增下载；多个下载器共用一块盘时取最严格的",
+            placeholder: "留空用缺省值",
+            hint: "这个下载器的下载盘用到多少就停止新增下载；多个下载器共用一块盘时取最严格的",
           },
-          { name: "resumePct", label: "恢复水位（%）", kind: "number", placeholder: "留空用全局" },
-          { name: "targetPct", label: "清理目标（%）", kind: "number", placeholder: "留空用全局" },
+          { name: "resumePct", label: "恢复线（%）", kind: "number", placeholder: "留空用缺省值" },
+          { name: "targetPct", label: "清理目标（%）", kind: "number", placeholder: "留空用缺省值" },
           {
             name: "seedDays",
             label: "保种天数",
             kind: "number",
-            placeholder: "留空用全局",
-            hint: "入库后至少保留几天再允许清理；公网 BT 可填 0（站点 H&R 要求仍然遵守）",
+            placeholder: "留空用缺省值",
+            hint: "整理后至少保留几天再允许清理；公网 BT 可填 0（站点 H&R 要求仍然遵守）",
           },
           {
             name: "hnrUnknownCleanable",