fix: 품목관리 수정 기능 버그 수정 및 Sales 페이지 추가

## 품목관리 수정 버그 수정
- FG(제품) 수정 시 품목명 반영 안되는 문제 해결
  - productName → name 필드 매핑 추가
  - FG 품목코드 = 품목명 동기화 로직 추가
- Materials(SM, RM, CS) 수정페이지 진입 오류 해결
- UNIQUE 제약조건 위반 오류 해결

## Sales 페이지
- 거래처관리 (client-management-sales-admin) 페이지 구현
- 견적관리 (quote-management) 페이지 구현
- 관련 컴포넌트 및 훅 추가

## 기타
- 회원가입 페이지 차단 처리
- 디버깅용 콘솔 로그 추가 (PUT 요청/응답 확인용)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/components/templates/IntegratedListTemplateV2.tsx

@@ -51,7 +51,7 @@ export interface PaginationConfig {
 
 export interface StatCard {
   label: string;
-  value: number;
+  value: string | number;
   icon: LucideIcon;
   iconColor: string;
 }
@@ -108,7 +108,7 @@ export interface IntegratedListTemplateV2Props<T = any> {
   allData?: T[]; // 모바일 인피니티 스크롤용 전체 필터된 데이터
   mobileDisplayCount?: number; // 모바일에서 표시할 개수
   onLoadMore?: () => void; // 더 불러오기 콜백
-  infinityScrollSentinelRef?: RefObject<HTMLDivElement>; // 인피니티 스크롤용 sentinel ref
+  infinityScrollSentinelRef?: RefObject<HTMLDivElement | null>; // 인피니티 스크롤용 sentinel ref
 
   // 체크박스 선택
   selectedItems: Set<string>;

src/components/templates/ResponsiveFormTemplate.tsx

@@ -0,0 +1,96 @@
+/**
+ * ResponsiveFormTemplate - 통합 등록 페이지 템플릿
+ */
+
+"use client";
+
+import { ReactNode } from "react";
+import { LucideIcon } from "lucide-react";
+import { PageLayout } from "../organisms/PageLayout";
+import { PageHeader } from "../organisms/PageHeader";
+import { FormActions } from "../organisms/FormActions";
+
+// Re-export form components for convenience
+export { FormSection } from "../organisms/FormSection";
+export type { FormSectionProps } from "../organisms/FormSection";
+export { FormField } from "../molecules/FormField";
+export type { FormFieldProps, FormFieldType, SelectOption } from "../molecules/FormField";
+export { FormFieldGrid } from "../organisms/FormFieldGrid";
+export type { FormFieldGridProps } from "../organisms/FormFieldGrid";
+export { FormActions } from "../organisms/FormActions";
+export type { FormActionsProps } from "../organisms/FormActions";
+
+export interface ResponsiveFormTemplateProps {
+  title: string;
+  description?: string;
+  icon?: LucideIcon;
+  headerActions?: ReactNode;
+  isEditMode?: boolean;
+  children: ReactNode;
+  onSave?: () => void;
+  onCancel?: () => void;
+  saveLabel?: string;
+  cancelLabel?: string;
+  saveDisabled?: boolean;
+  saveLoading?: boolean;
+  showActions?: boolean;
+  customActions?: ReactNode;
+  className?: string;
+  maxWidth?: 'sm' | 'md' | 'lg' | 'xl' | '2xl' | 'full';
+  versionInfo?: ReactNode;
+}
+
+export function ResponsiveFormTemplate({
+  title,
+  description,
+  icon,
+  headerActions,
+  isEditMode,
+  children,
+  onSave,
+  onCancel,
+  saveLabel = "저장",
+  cancelLabel = "취소",
+  saveDisabled = false,
+  saveLoading = false,
+  showActions = true,
+  customActions,
+  className = "",
+  maxWidth = 'full',
+  versionInfo,
+}: ResponsiveFormTemplateProps) {
+
+  return (
+    <PageLayout maxWidth={maxWidth} versionInfo={versionInfo}>
+      {/* 헤더 */}
+      <PageHeader
+        title={title}
+        description={description}
+        icon={icon}
+        rightActions={headerActions}
+        isEditMode={isEditMode}
+      />
+
+      {/* 메인 컨텐츠 */}
+      <div className={`space-y-6 ${className}`}>
+        {children}
+      </div>
+
+      {/* 하단 액션 버튼 */}
+      {showActions && (
+        <div className="sticky bottom-0 bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/60 border-t pt-4 pb-4 -mx-3 md:-mx-6 px-3 md:px-6 mt-6">
+          {customActions || (
+            <FormActions
+              onSave={onSave}
+              onCancel={onCancel}
+              saveLabel={saveLabel}
+              cancelLabel={cancelLabel}
+              saveDisabled={saveDisabled}
+              saveLoading={saveLoading}
+            />
+          )}
+        </div>
+      )}
+    </PageLayout>
+  );
+}