copy: second-round copy review across console, settings, agent and server messages

- Trim descriptions, empty states, confirm buttons and toasts to facts
- Unify terms per glossary: 待处理/待识别/整理记录/运行记录/凭证/子会话/Agent 上游
- Subscription-login termsNote states facts only (borrowed client identity, ToS/ban risk)
- Shorter, concrete goal templates for built-in Agent checks
- Human-readable nouns instead of table names in instance CRUD errors
- Audit labels for pi_upstream / schedule / automation_grant actions
- Glossary: add 上游、订阅登录、凭证、定时任务、巡检、运行记录、子会话、停止、持续授权

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

apps/server/test/e2e/e11-subagents.test.ts

@@ -275,7 +275,7 @@ describe.skipIf(!hasPg)("E11 Pi 子代理(agent.spawn / agent.await)", () => {
     await e.settings({ pi: { subagents: { enabled: false } } });
     expect(await spawn(parent.id, { goal: "关闭后" })).toMatchObject({
       code: "precondition",
-      message: expect.stringContaining("子代理未开启"),
+      message: expect.stringContaining("子会话未开启"),
     });
     await e.settings({ pi: { subagents: { enabled: true } } });
     // 以上都没有建出子会话