Move AdminZoneSection out of the generated contracts mirror

Why: src/contracts.ts is fully regenerated from Core by make contracts;
the hand-added interface there is deleted on every sync (surfaced as a
dirty tree in the Dev composite test run).
Evidence: npx vitest run 101/101, tsc --noEmit clean, knip 42 <= 43;
Dev composite CI is authoritative.
Impact: AdminZoneSection now lives in api.ts (backend-only endpoint
type, matching existing local-type precedent); contracts.ts restored to
the generated mirror; imports updated in store and AdminZone.
Refs: WP3-I3; follows Frontend PR #63.

src/api.ts

@@ -1,7 +1,7 @@
 // API 客户端（API-first：UI 只是第一个客户端）与 SSE 流客户端（游标重放 + 终态对账）。
 // 认证：服务端开启 API key 时经 auth.fetch/withKey 注入凭证（嵌入式档无认证则透传）。
 import { auth } from './auth'
-import type { AdminZoneSection,
+import type {
   Project, Conversation, Message, Run, Artifact, HITLCard, HITLResponse,
   AgentProfile, SettingDesc, StreamEvent, StreamEventType, PlanSnapshot, TodoList, UploadInfo, PromptModule,
   ActivityCard,
@@ -9,6 +9,11 @@ import type { AdminZoneSection,
 
 const BASE = ''
 
+/** 管理区声明分区（WP3-I3/KTD4，backend 专属端点类型）：编译插件经
+ *  Registry.AddAdminZone 声明；入口不做前端权限合并，区内数据能力由组件
+ *  自身命令面 fail-closed。 */
+export interface AdminZoneSection { id: string; title: string; icon?: string; desc?: string; order?: number }
+
 async function json<T>(res: Response): Promise<T> {
   if (!res.ok) {
     const text = await res.text()

src/components/AdminZone.tsx

@@ -9,7 +9,7 @@ import { store, useStore } from '../store'
 import { EmptyState, Icon, type IconName } from '@ui'
 import { UsersPanel, ProfilesSection, PluginsSection, PluginWorkspacesPanel } from './adminSections'
 import { RdmAuditWorkspace } from './RdmAuditWorkspace'
-import type { AdminZoneSection } from '../contracts'
+import type { AdminZoneSection } from '../api'
 
 interface AdminSectionDef {
   key: string

src/contracts.ts

@@ -288,13 +288,6 @@ export interface PluginManifest {
   backend?: { mode?: 'inproc' | 'sidecar'; command?: string; args?: string[]; schemaVersion?: number };
 }
 
-// ---- 管理区声明分区（WP3-I3/KTD4）----
-/** 编译插件经 Registry.AddAdminZone 声明的管理区展示分区；入口不做前端权限合并，
- *  分区内数据能力由组件自身的命令面 fail-closed。 */
-export interface AdminZoneSection {
-  id: string; title: string; icon?: string; desc?: string; order?: number;
-}
-
 export interface PluginPanel {
   id: string; title: string; icon?: string; body: UINode[]; refreshTool?: string;
 }

src/store.ts

@@ -1,7 +1,7 @@
 // 应用状态：服务端权威（事件 + Query 对账），前端 store 是投影。
 // useSyncExternalStore 驱动；live 流式部件为会话内临时态，run 终态后由消息树对账收敛。
 import { useSyncExternalStore } from 'react'
-import { api, connectEvents } from './api'
+import { type AdminZoneSection, api, connectEvents } from './api'
 import { applyTextDelta, applyThinkingDelta, applyToolCall, applyToolCallDelta, applyToolResult, applyToolOutput, applyArtifactCreated, applyArtifactUpdated, applyCheck, applyFinalizing, type LiveItem } from './live'
 import { closePreviewTab, mergeOrphanPreviewTabs, openPreviewTab, previewTabsKey, type PreviewTab } from './previewtabs'
 import { deliveryRequestId, enqueueMessage, enqueueMessageFront, newQueuedMessage, promoteQueuedMessage, removeQueuedMessage, replaceQueuedText, type QueuedMessage } from './outbox'
@@ -15,7 +15,7 @@ const FONT_SIZE_CHOICES: readonly FontSizeChoice[] = [13, 14, 16, 18]
 export function isFontSizeChoice(value: number): value is FontSizeChoice {
   return (FONT_SIZE_CHOICES as readonly number[]).includes(value)
 }
-import type { AdminZoneSection,
+import type {
   ActivityCard,
   AgentProfile,
   Artifact,