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]>

packages/contracts/src/settings.ts

@@ -406,7 +406,7 @@ export const SETTINGS_SECTIONS: readonly SettingsSectionDef[] = [
     legacyTabs: [{ tab: "pi" }],
     anchors: [
       { id: "upstream", label: "上游" },
-      { id: "runtime", label: "上下文与子代理" },
+      { id: "runtime", label: "上下文与子会话" },
       { id: "budget", label: "预算" },
       { id: "investigate", label: "自动调查" },
       { id: "advanced", label: "高级" },