feat: 完成進貨單自動拋轉應付帳款流程與AP介面優化

1. 新增 AccountPayable (應付帳款) 模組，包含 Migration、Model、Service 與 Controller
2. 修改 GoodsReceipt (進貨單) 流程，在確認進貨時自動產生對應的應付帳款單 (AP-YYYYMMDD-XX)
3. 實作應付帳款詳細頁面 (Show.tsx)，包含發票登記與標記付款功能
4. 修正應付帳款 Show 頁面的排版，將發票資訊套用標準的綠色背景區塊，並調整按鈕位置
5. 更新相關的 Service Provider 與 Routes

fix_ap.php

@@ -0,0 +1,24 @@
+<?php
+use App\Modules\Finance\Models\AccountPayable;
+use App\Modules\Inventory\Models\GoodsReceiptItem;
+
+$ap = AccountPayable::latest()->first();
+if ($ap) {
+    if (!$ap->total_amount || $ap->total_amount == 0) {
+        $sum = GoodsReceiptItem::where('goods_receipt_id', $ap->source_document_id)->sum('total_amount');
+        if ($sum == 0) {
+            // fallback: check if unit_price * quantity_received works
+            $items = GoodsReceiptItem::where('goods_receipt_id', $ap->source_document_id)->get();
+            foreach($items as $item) {
+                $sum += ($item->quantity_received * $item->unit_price);
+            }
+        }
+        $ap->total_amount = $sum;
+        $ap->save();
+        echo "Fixed AP {$ap->document_number} total_amount to {$sum}\n";
+    } else {
+        echo "AP total_amount is already set: {$ap->total_amount}\n";
+    }
+} else {
+    echo "No AP found\n";
+}