feat: 修正庫存與撥補單邏輯並整合文件

1. 修復倉庫統計數據加總與樣式。
2. 修正可用庫存計算邏輯（排除不可銷售倉庫）。
3. 撥補單商品列表加入批號與效期顯示。
4. 修正撥補單儲存邏輯以支援精確批號轉移。
5. 整合 FEATURES.md 至 README.md。

app/Modules/Inventory/Models/Inventory.php

@@ -4,7 +4,7 @@ namespace App\Modules\Inventory\Models;
 
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
-use App\Modules\Procurement\Models\PurchaseOrder; // Cross-module dependency
+
 
 class Inventory extends Model
 {
@@ -35,8 +35,8 @@ class Inventory extends Model
     ];
 
     /**
-     * Transient property to store the reason for the activity log (e.g., "Replenishment #123").
-     * This is not stored in the database column but used for logging context.
+     * 用於活動記錄的暫時屬性（例如 "補貨 #123"）。
+     * 此屬性不存儲在資料庫欄位中，但用於記錄上下文。
      * @var string|null
      */
     public $activityLogReason;
@@ -55,12 +55,12 @@ class Inventory extends Model
         $attributes = $properties['attributes'] ?? [];
         $snapshot = $properties['snapshot'] ?? [];
 
-        // Always snapshot names for context, even if IDs didn't change
-        // $this refers to the Inventory model instance
+        // 始終對名稱進行快照以便於上下文顯示，即使 ID 未更改
+        // $this 指的是 Inventory 模型實例
         $snapshot['warehouse_name'] = $this->warehouse ? $this->warehouse->name : ($snapshot['warehouse_name'] ?? null);
         $snapshot['product_name'] = $this->product ? $this->product->name : ($snapshot['product_name'] ?? null);
 
-        // Capture the reason if set
+        // 如果已設定原因，則進行捕捉
         if ($this->activityLogReason) {
             $attributes['_reason'] = $this->activityLogReason;
         }
@@ -105,13 +105,7 @@ class Inventory extends Model
         });
     }
 
-    /**
-     * 來源採購單
-     */
-    public function sourcePurchaseOrder(): \Illuminate\Database\Eloquent\Relations\BelongsTo
-    {
-        return $this->belongsTo(PurchaseOrder::class, 'source_purchase_order_id');
-    }
+
 
     /**
      * 產生批號