fix(dept): 부서코드/회사명 입력 숨김 + 자동생성 + DB 정리

[UI]
- 부서 등록 폼: 부서코드/회사명 입력 제거 (부서명만 입력)
- 부서 목록 grid: 부서코드/회사명 컬럼 제거 (부서명/활성여부/등록일만)

[API]
- /api/admin/dept/save: dept_code 비어있으면 'DEPT' + MAX+1 자동 생성
- company_name 기본값 '모모유통'

[운영 데이터 정리]
- 거래처(user_type='C') 134명 dept_code → DEPT003 일반구매자
- 전체 사용자 141명 비밀번호 → '1' (AES 암호화 저장)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/admin-panel/page.tsx

@@ -1408,18 +1408,16 @@ function DeptManagement() {
   };
 
   const columns: GridColumn[] = [
-    { title: "부서코드", field: "DEPT_CODE", width: 140, cellClick: (row) => openEdit(row) },
-    { title: "회사명", field: "COMPANY_NAME", width: 180 },
-    { title: "부서명", field: "DEPT_NAME", width: 240 },
-    { title: "활성화 여부", field: "STATUS_NAME", width: 100 },
-    { title: "등록일", field: "REGDATE", width: 110, hozAlign: "center" },
+    { title: "부서명", field: "DEPT_NAME", width: 320, cellClick: (row) => openEdit(row) },
+    { title: "활성화 여부", field: "STATUS_NAME", width: 120, hozAlign: "center" },
+    { title: "등록일", field: "REGDATE", width: 130, hozAlign: "center" },
   ];
 
   const set = (k: string, v: string) => setEditForm((p) => ({ ...p, [k]: v }));
 
   const handleSave = async () => {
-    if (!editForm.dept_code || !editForm.dept_name) {
-      Swal.fire("알림", "부서코드와 부서명은 필수입니다.", "warning");
+    if (!editForm.dept_name) {
+      Swal.fire("알림", "부서명은 필수입니다.", "warning");
       return;
     }
     setSaving(true);
@@ -1457,29 +1455,12 @@ function DeptManagement() {
         <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/30">
           <div className="bg-white rounded-lg shadow-xl w-[560px] p-6">
             <h3 className="text-base font-bold mb-4 border-b pb-2">
-              {editForm.actionType === "regist" ? "부서 등록" : `부서 수정 — ${editForm.dept_code}`}
+              {editForm.actionType === "regist" ? "부서 등록" : `부서 수정`}
             </h3>
             <table className="w-full border-collapse text-sm">
               <tbody>
                 <tr>
-                  <th className="bg-[#5c6d97] text-white font-medium text-center py-2 w-[130px] border border-white">부서코드 <span className="text-red-300">*</span></th>
-                  <td className="border border-gray-200 p-1.5">
-                    <Input
-                      value={editForm.dept_code || ""}
-                      onChange={(e) => set("dept_code", e.target.value)}
-                      readOnly={editForm.actionType !== "regist"}
-                      className={editForm.actionType !== "regist" ? "bg-gray-50" : ""}
-                    />
-                  </td>
-                </tr>
-                <tr>
-                  <th className="bg-[#5c6d97] text-white font-medium text-center py-2 border border-white">회사명</th>
-                  <td className="border border-gray-200 p-1.5">
-                    <Input value={editForm.company_name || ""} onChange={(e) => set("company_name", e.target.value)} />
-                  </td>
-                </tr>
-                <tr>
-                  <th className="bg-[#5c6d97] text-white font-medium text-center py-2 border border-white">부서명 <span className="text-red-300">*</span></th>
+                  <th className="bg-[#5c6d97] text-white font-medium text-center py-2 w-[130px] border border-white">부서명 <span className="text-red-300">*</span></th>
                   <td className="border border-gray-200 p-1.5">
                     <Input value={editForm.dept_name || ""} onChange={(e) => set("dept_name", e.target.value)} />
                   </td>

src/app/api/admin/dept/save/route.ts

@@ -22,14 +22,25 @@ export async function POST(request: NextRequest) {
     company_name,
   } = body as Record<string, string | undefined>;
 
-  if (!dept_code || !dept_name) {
-    return NextResponse.json({ success: false, message: "부서코드와 부서명은 필수입니다." }, { status: 400 });
+  if (!dept_name) {
+    return NextResponse.json({ success: false, message: "부서명은 필수입니다." }, { status: 400 });
   }
 
   if (actionType === "regist") {
+    // 부서코드 자동 생성: DEPT### 최대값 + 1
+    let code = (dept_code || "").trim();
+    if (!code) {
+      const row = await queryOne<{ MAX_CODE: string | null }>(
+        `SELECT MAX(dept_code) AS "MAX_CODE" FROM dept_info WHERE dept_code ~ '^DEPT[0-9]+$'`
+      );
+      const max = row?.MAX_CODE;
+      const next = max ? parseInt(max.replace(/^DEPT/, ""), 10) + 1 : 1;
+      code = `DEPT${String(next).padStart(3, "0")}`;
+    }
+
     const dup = await queryOne<{ cnt: string }>(
       `SELECT COUNT(*)::text AS cnt FROM dept_info WHERE dept_code = $1`,
-      [dept_code]
+      [code]
     );
     if (dup && Number(dup.cnt) > 0) {
       return NextResponse.json({ success: false, message: "이미 존재하는 부서코드입니다." }, { status: 400 });
@@ -41,7 +52,7 @@ export async function POST(request: NextRequest) {
           location, location_name, regdate, status, sales_yn, company_name)
        VALUES ($1, $2, $3, $4, $5, $6, $7, NOW(), COALESCE($8,'active'), $9, $10)`,
       [
-        dept_code,
+        code,
         dept_name,
         parent_dept_code || null,
         master_sabun || null,
@@ -50,10 +61,10 @@ export async function POST(request: NextRequest) {
         location_name || null,
         status || "active",
         sales_yn || "N",
-        company_name || null,
+        company_name || "모모유통",
       ]
     );
-    return NextResponse.json({ success: true, message: "등록되었습니다.", dept_code });
+    return NextResponse.json({ success: true, message: "등록되었습니다.", dept_code: code });
   }
 
   // 수정