chore: 完善模組化架構遷移與修復前端顯示錯誤

- 修正所有模組 Controller 的 Model 引用路徑 (App\Modules\...)
- 更新 ProductionOrder 與 ProductionOrderItem 模型結構以符合新版邏輯
- 修復 resources/js/utils/format.ts 在處理空值時導致 toLocaleString 崩潰的問題
- 清除全域路徑與 Controller 遷移殘留檔案

database/factories/ProductFactory.php

@@ -2,11 +2,11 @@
 
 namespace Database\Factories;
 
-use App\Models\Category;
+use App\Modules\Inventory\Models\Category;
 use Illuminate\Database\Eloquent\Factories\Factory;
 
 /**
- * @extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Models\Product>
+ * @extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Modules\Inventory\Models\Product>
  */
 class ProductFactory extends Factory
 {

database/factories/UserFactory.php

@@ -7,7 +7,7 @@ use Illuminate\Support\Facades\Hash;
 use Illuminate\Support\Str;
 
 /**
- * @extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Models\User>
+ * @extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Modules\Core\Models\User>
  */
 class UserFactory extends Factory
 {