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>

system1-factory/api/models/purchaseRequestModel.js

@@ -0,0 +1,94 @@
+// models/purchaseRequestModel.js
+const { getDb } = require('../dbPool');
+
+const PurchaseRequestModel = {
+  // 구매신청 목록 (소모품 정보 JOIN)
+  async getAll(filters = {}) {
+    const db = await getDb();
+    let sql = `
+      SELECT pr.*, ci.item_name, ci.maker, ci.category, ci.base_price, ci.unit, ci.photo_path,
+             su.name AS requester_name
+      FROM purchase_requests pr
+      JOIN consumable_items ci ON pr.item_id = ci.item_id
+      LEFT JOIN sso_users su ON pr.requester_id = su.user_id
+      WHERE 1=1
+    `;
+    const params = [];
+
+    if (filters.status) { sql += ' AND pr.status = ?'; params.push(filters.status); }
+    if (filters.requester_id) { sql += ' AND pr.requester_id = ?'; params.push(filters.requester_id); }
+    if (filters.category) { sql += ' AND ci.category = ?'; params.push(filters.category); }
+    if (filters.from_date) { sql += ' AND pr.request_date >= ?'; params.push(filters.from_date); }
+    if (filters.to_date) { sql += ' AND pr.request_date <= ?'; params.push(filters.to_date); }
+
+    sql += ' ORDER BY pr.created_at DESC';
+    const [rows] = await db.query(sql, params);
+    return rows;
+  },
+
+  // 단건 조회
+  async getById(requestId) {
+    const db = await getDb();
+    const [rows] = await db.query(`
+      SELECT pr.*, ci.item_name, ci.maker, ci.category, ci.base_price, ci.unit, ci.photo_path,
+             su.name AS requester_name
+      FROM purchase_requests pr
+      JOIN consumable_items ci ON pr.item_id = ci.item_id
+      LEFT JOIN sso_users su ON pr.requester_id = su.user_id
+      WHERE pr.request_id = ?
+    `, [requestId]);
+    return rows[0] || null;
+  },
+
+  // 구매신청 생성
+  async create(data) {
+    const db = await getDb();
+    const [result] = await db.query(
+      `INSERT INTO purchase_requests (item_id, quantity, requester_id, request_date, notes)
+       VALUES (?, ?, ?, ?, ?)`,
+      [data.item_id, data.quantity || 1, data.requester_id, data.request_date, data.notes || null]
+    );
+    return this.getById(result.insertId);
+  },
+
+  // 상태 변경 (보류)
+  async hold(requestId, holdReason) {
+    const db = await getDb();
+    await db.query(
+      `UPDATE purchase_requests SET status = 'hold', hold_reason = ? WHERE request_id = ?`,
+      [holdReason || null, requestId]
+    );
+    return this.getById(requestId);
+  },
+
+  // 상태 → purchased
+  async markPurchased(requestId) {
+    const db = await getDb();
+    await db.query(
+      `UPDATE purchase_requests SET status = 'purchased' WHERE request_id = ?`,
+      [requestId]
+    );
+  },
+
+  // pending으로 되돌리기
+  async revertToPending(requestId) {
+    const db = await getDb();
+    await db.query(
+      `UPDATE purchase_requests SET status = 'pending', hold_reason = NULL WHERE request_id = ?`,
+      [requestId]
+    );
+    return this.getById(requestId);
+  },
+
+  // 삭제 (admin only, pending 상태만)
+  async delete(requestId) {
+    const db = await getDb();
+    const [result] = await db.query(
+      `DELETE FROM purchase_requests WHERE request_id = ? AND status = 'pending'`,
+      [requestId]
+    );
+    return result.affectedRows > 0;
+  }
+};
+
+module.exports = PurchaseRequestModel;