feat(purchase): 생산소모품 구매 관리 시스템 구현

tkuser: 업체(공급업체) CRUD + 소모품 마스터 CRUD (사진 업로드 포함)
tkfb: 구매신청 → 구매 처리 → 월간 분석/정산 전체 워크플로
설비(equipment) 분류 구매 시 자동 등록 + 실패 시 admin 알림

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

user-management/api/middleware/upload.js

@@ -5,6 +5,7 @@
 const multer = require('multer');
 const path = require('path');
 const crypto = require('crypto');
+const fs = require('fs');
 
 const storage = multer.diskStorage({
   destination: (req, file, cb) => {
@@ -32,4 +33,26 @@ const upload = multer({
   limits: { fileSize: 5 * 1024 * 1024 }
 });
 
+// 소모품 사진 업로드
+const consumablesDir = path.join(__dirname, '..', 'uploads', 'consumables');
+if (!fs.existsSync(consumablesDir)) { fs.mkdirSync(consumablesDir, { recursive: true }); }
+
+const consumableStorage = multer.diskStorage({
+  destination: (req, file, cb) => {
+    cb(null, consumablesDir);
+  },
+  filename: (req, file, cb) => {
+    const ext = path.extname(file.originalname).toLowerCase();
+    const uniqueName = `consumable-${Date.now()}-${crypto.randomInt(100000000, 999999999)}${ext}`;
+    cb(null, uniqueName);
+  }
+});
+
+const consumableUpload = multer({
+  storage: consumableStorage,
+  fileFilter,
+  limits: { fileSize: 5 * 1024 * 1024 }
+});
+
 module.exports = upload;
+module.exports.consumableUpload = consumableUpload;