[feat]: Item Master 데이터 관리 기능 구현 및 타입 에러 수정

- ItemMasterDataManagement 컴포넌트 구조화 (tabs, dialogs, components 분리)
- HierarchyTab 타입 에러 수정 (BOMItem section_id, updated_at 추가)
- API 클라이언트 구현 (item-master.ts, 13개 엔드포인트)
- ItemMasterContext 구현 (상태 관리 및 데이터 흐름)
- 백엔드 요구사항 문서 작성 (CORS 설정, API 스펙 등)
- SSR 호환성 수정 (navigator API typeof window 체크)
- 미사용 변수 ESLint 에러 해결
- Context 리팩토링 (AuthContext, RootProvider 추가)
- API 유틸리티 추가 (error-handler, logger, transformers)

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

src/app/[locale]/(protected)/layout.tsx

@@ -2,8 +2,7 @@
 
 import { useAuthGuard } from '@/hooks/useAuthGuard';
 import DashboardLayout from '@/layouts/DashboardLayout';
-import { DataProvider } from '@/contexts/DataContext';
-import { DeveloperModeProvider } from '@/contexts/DeveloperModeContext';
+import { RootProvider } from '@/contexts/RootProvider';
 
 /**
  * Protected Layout
@@ -11,7 +10,7 @@ import { DeveloperModeProvider } from '@/contexts/DeveloperModeContext';
  * Purpose:
  * - Apply authentication guard to all protected pages
  * - Apply common layout (sidebar, header) to all protected pages
- * - Provide global context (DataProvider, DeveloperModeProvider)
+ * - Provide global context (RootProvider)
  * - Prevent browser back button cache issues
  * - Centralized protection for all routes under (protected)
  *
@@ -32,10 +31,8 @@ export default function ProtectedLayout({
 
   // 🎨 모든 하위 페이지에 공통 레이아웃 및 Context 적용
   return (
-    <DataProvider>
-      <DeveloperModeProvider>
-        <DashboardLayout>{children}</DashboardLayout>
-      </DeveloperModeProvider>
-    </DataProvider>
+    <RootProvider>
+      <DashboardLayout>{children}</DashboardLayout>
+    </RootProvider>
   );
 }

src/app/api/tenants/[tenantId]/item-master-config/pages/[pageId]/route.ts

@@ -0,0 +1,60 @@
+import { NextRequest } from 'next/server';
+import { proxyToPhpBackend } from '@/lib/api/php-proxy';
+
+/**
+ * 특정 페이지 조회 API
+ *
+ * 엔드포인트: GET /api/tenants/{tenantId}/item-master-config/pages/{pageId}
+ */
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ tenantId: string; pageId: string }> }
+) {
+  const { tenantId, pageId } = await params;
+
+  return proxyToPhpBackend(
+    request,
+    `/api/v1/tenants/${tenantId}/item-master-config/pages/${pageId}`,
+    { method: 'GET' }
+  );
+}
+
+/**
+ * 특정 페이지 업데이트 API
+ *
+ * 엔드포인트: PUT /api/tenants/{tenantId}/item-master-config/pages/{pageId}
+ */
+export async function PUT(
+  request: NextRequest,
+  { params }: { params: Promise<{ tenantId: string; pageId: string }> }
+) {
+  const { tenantId, pageId } = await params;
+  const body = await request.json();
+
+  return proxyToPhpBackend(
+    request,
+    `/api/v1/tenants/${tenantId}/item-master-config/pages/${pageId}`,
+    {
+      method: 'PUT',
+      body: JSON.stringify(body),
+    }
+  );
+}
+
+/**
+ * 특정 페이지 삭제 API
+ *
+ * 엔드포인트: DELETE /api/tenants/{tenantId}/item-master-config/pages/{pageId}
+ */
+export async function DELETE(
+  request: NextRequest,
+  { params }: { params: Promise<{ tenantId: string; pageId: string }> }
+) {
+  const { tenantId, pageId } = await params;
+
+  return proxyToPhpBackend(
+    request,
+    `/api/v1/tenants/${tenantId}/item-master-config/pages/${pageId}`,
+    { method: 'DELETE' }
+  );
+}

src/app/api/tenants/[tenantId]/item-master-config/route.ts

@@ -0,0 +1,74 @@
+import { NextRequest } from 'next/server';
+import { proxyToPhpBackend, appendQueryParams } from '@/lib/api/php-proxy';
+
+/**
+ * 품목기준관리 전체 설정 조회 API
+ *
+ * 엔드포인트: GET /api/tenants/{tenantId}/item-master-config
+ *
+ * 역할:
+ * - PHP 백엔드로 단순 프록시
+ * - tenant.id 검증은 PHP에서 수행
+ * - PHP가 403 반환하면 그대로 전달
+ */
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ tenantId: string }> }
+) {
+  const { tenantId } = await params;
+  const { searchParams } = new URL(request.url);
+
+  // PHP 엔드포인트 생성 (query params 포함)
+  const phpEndpoint = appendQueryParams(
+    `/api/v1/tenants/${tenantId}/item-master-config`,
+    searchParams
+  );
+
+  return proxyToPhpBackend(request, phpEndpoint, {
+    method: 'GET',
+  });
+}
+
+/**
+ * 품목기준관리 전체 설정 저장 API
+ *
+ * 엔드포인트: POST /api/tenants/{tenantId}/item-master-config
+ */
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ tenantId: string }> }
+) {
+  const { tenantId } = await params;
+  const body = await request.json();
+
+  return proxyToPhpBackend(
+    request,
+    `/api/v1/tenants/${tenantId}/item-master-config`,
+    {
+      method: 'POST',
+      body: JSON.stringify(body),
+    }
+  );
+}
+
+/**
+ * 품목기준관리 전체 설정 업데이트 API
+ *
+ * 엔드포인트: PUT /api/tenants/{tenantId}/item-master-config
+ */
+export async function PUT(
+  request: NextRequest,
+  { params }: { params: Promise<{ tenantId: string }> }
+) {
+  const { tenantId } = await params;
+  const body = await request.json();
+
+  return proxyToPhpBackend(
+    request,
+    `/api/v1/tenants/${tenantId}/item-master-config`,
+    {
+      method: 'PUT',
+      body: JSON.stringify(body),
+    }
+  );
+}