Phase 3 발주/입고/재고 관리 구현

- DB: bag_order, bag_order_item, bag_receiving, bag_inventory 테이블
- 발주: UUID v4, SHA-256 해시, LOT번호 자동생성, 봉투별 품목 관리
  - 포장단위 연동 (박스→낱장 자동 환산), 단가 연동 (금액 자동 계산)
  - 발주 현황 (기간/상태 필터), 상세 조회, 취소/삭제 (상태 변경)
- 입고: 발주건 기반 입고 처리, 박스→낱장 환산, 재고 자동 가산
- 재고: 지자체별 봉투 종류별 현재 재고 조회
- E2E 테스트 7개 전체 통과

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/Models/BagInventoryModel.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Models;
+
+use CodeIgniter\Model;
+
+class BagInventoryModel extends Model
+{
+    protected $table         = 'bag_inventory';
+    protected $primaryKey    = 'bi_idx';
+    protected $returnType    = 'object';
+    protected $useTimestamps = false;
+    protected $allowedFields = [
+        'bi_lg_idx', 'bi_bag_code', 'bi_bag_name', 'bi_qty', 'bi_updated_at',
+    ];
+
+    /**
+     * 재고 증감 (upsert)
+     */
+    public function adjustQty(int $lgIdx, string $bagCode, string $bagName, int $delta): void
+    {
+        $existing = $this->where('bi_lg_idx', $lgIdx)->where('bi_bag_code', $bagCode)->first();
+        if ($existing) {
+            $this->update($existing->bi_idx, [
+                'bi_qty'        => max(0, (int) $existing->bi_qty + $delta),
+                'bi_updated_at' => date('Y-m-d H:i:s'),
+            ]);
+        } else {
+            $this->insert([
+                'bi_lg_idx'    => $lgIdx,
+                'bi_bag_code'  => $bagCode,
+                'bi_bag_name'  => $bagName,
+                'bi_qty'       => max(0, $delta),
+                'bi_updated_at'=> date('Y-m-d H:i:s'),
+            ]);
+        }
+    }
+}

app/Models/BagOrderItemModel.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Models;
+
+use CodeIgniter\Model;
+
+class BagOrderItemModel extends Model
+{
+    protected $table         = 'bag_order_item';
+    protected $primaryKey    = 'boi_idx';
+    protected $returnType    = 'object';
+    protected $useTimestamps = false;
+    protected $allowedFields = [
+        'boi_bo_idx', 'boi_bag_code', 'boi_bag_name',
+        'boi_unit_price', 'boi_qty_box', 'boi_qty_sheet', 'boi_amount',
+    ];
+}

app/Models/BagOrderModel.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Models;
+
+use CodeIgniter\Model;
+
+class BagOrderModel extends Model
+{
+    protected $table         = 'bag_order';
+    protected $primaryKey    = 'bo_idx';
+    protected $returnType    = 'object';
+    protected $useTimestamps = false;
+    protected $allowedFields = [
+        'bo_uuid', 'bo_version', 'bo_lg_idx', 'bo_gugun_code', 'bo_dong_code',
+        'bo_company_idx', 'bo_agency_idx', 'bo_fee_rate', 'bo_order_date',
+        'bo_lot_no', 'bo_hash', 'bo_status', 'bo_orderer_idx',
+        'bo_regdate', 'bo_moddate',
+    ];
+}

app/Models/BagReceivingModel.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Models;
+
+use CodeIgniter\Model;
+
+class BagReceivingModel extends Model
+{
+    protected $table         = 'bag_receiving';
+    protected $primaryKey    = 'br_idx';
+    protected $returnType    = 'object';
+    protected $useTimestamps = false;
+    protected $allowedFields = [
+        'br_bo_idx', 'br_lg_idx', 'br_bag_code', 'br_bag_name',
+        'br_qty_box', 'br_qty_sheet', 'br_receive_date',
+        'br_receiver_idx', 'br_sender_name', 'br_type', 'br_regdate',
+    ];
+}