[FEAT] 實作公共事業費附件上傳管理與更新 UI 協作規範防呆機制

database/migrations/tenant/2026_03_06_113117_create_utility_fee_attachments_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('utility_fee_attachments', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('utility_fee_id')->constrained('utility_fees')->cascadeOnDelete();
+            $table->string('file_path');          // 儲存路徑
+            $table->string('original_name');      // 原始檔名
+            $table->string('mime_type');          // MIME 類型
+            $table->unsignedBigInteger('size');   // 檔案大小 (bytes)
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('utility_fee_attachments');
+    }
+};