refactor(admin): split lib/sdk/context.tsx (1280 LOC) into focused modules

Extract the monolithic SDK context provider into seven focused modules:
- context-types.ts (203 LOC): SDKContextValue interface, initialState, ExtendedSDKAction
- context-reducer.ts (353 LOC): sdkReducer with all action handlers
- context-provider.tsx (495 LOC): SDKProvider component + SDKContext
- context-hooks.ts (17 LOC): useSDK hook
- context-validators.ts (94 LOC): local checkpoint validation logic
- context-projects.ts (67 LOC): project management API helpers
- context-sync-helpers.ts (145 LOC): sync infrastructure init/cleanup/callbacks
- context.tsx (23 LOC): barrel re-export preserving existing import paths

All files under the 500-line hard cap. Build verified with `npx next build`.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-compliance/lib/sdk/context-projects.ts

@@ -0,0 +1,67 @@
+import React from 'react'
+import { SDKApiClient, getSDKApiClient } from './api-client'
+import { CustomerType, ProjectInfo } from './types'
+
+// =============================================================================
+// PROJECT MANAGEMENT HELPERS
+// =============================================================================
+
+/**
+ * Ensures an API client is available. If the ref is null and backend sync is
+ * enabled, lazily initialises one. Returns the client or throws.
+ */
+export function ensureApiClient(
+  apiClientRef: React.MutableRefObject<SDKApiClient | null>,
+  enableBackendSync: boolean,
+  tenantId: string,
+  projectId?: string
+): SDKApiClient {
+  if (!apiClientRef.current && enableBackendSync) {
+    apiClientRef.current = getSDKApiClient(tenantId, projectId)
+  }
+  if (!apiClientRef.current) {
+    throw new Error('Backend sync not enabled')
+  }
+  return apiClientRef.current
+}
+
+export async function createProjectApi(
+  apiClient: SDKApiClient,
+  name: string,
+  customerType: CustomerType,
+  copyFromProjectId?: string
+): Promise<ProjectInfo> {
+  return apiClient.createProject({
+    name,
+    customer_type: customerType,
+    copy_from_project_id: copyFromProjectId,
+  })
+}
+
+export async function listProjectsApi(
+  apiClient: SDKApiClient
+): Promise<ProjectInfo[]> {
+  const result = await apiClient.listProjects()
+  return result.projects
+}
+
+export async function archiveProjectApi(
+  apiClient: SDKApiClient,
+  archiveId: string
+): Promise<void> {
+  await apiClient.archiveProject(archiveId)
+}
+
+export async function restoreProjectApi(
+  apiClient: SDKApiClient,
+  restoreId: string
+): Promise<ProjectInfo> {
+  return apiClient.restoreProject(restoreId)
+}
+
+export async function permanentlyDeleteProjectApi(
+  apiClient: SDKApiClient,
+  deleteId: string
+): Promise<void> {
+  await apiClient.permanentlyDeleteProject(deleteId)
+}