copy(server): 下载、整理、站点、浏览器、字幕等模块错误与提示文案重写

缓存卷 → 下载盘;站点快照 → 站点列表抓取;Feed → RSS;去掉猜测原因与「请…」;同步断言。

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

apps/server/src/modules/agent/capabilities-download.ts

@@ -55,7 +55,7 @@ export function registerDownloadRecoveryCapabilities(
     if (status === "paused" && (dt.pause_reason === "threshold" || dt.pause_reason === "user"))
       throw new CapabilityError(
         "precondition",
-        `${dt.pause_reason === "threshold" ? "缓存阈值" : "人工"}暂停不做自动恢复`,
+        `${dt.pause_reason === "threshold" ? "因下载盘到暂停线" : "手动"}暂停的任务不自动恢复`,
       );
     if (c.authorization?.grantId) await checkGrantScope(ctx, c.authorization.grantId, dt.acquisition_plan_id);
     const inst = await ctx.db