feat: Add change orders system with client approval/rejection and integrate with client portal

database/migrations/2026_05_25_164538_create_change_orders_table.php

@@ -0,0 +1,35 @@
+<?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('change_orders', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('project_id')->constrained()->onDelete('cascade');
+            $table->string('title');
+            $table->text('description');
+            $table->decimal('amount', 10, 2)->default(0.00);
+            $table->enum('status', ['pending', 'approved', 'rejected'])->default('pending');
+            $table->date('requested_at');
+            $table->date('responded_at')->nullable();
+            $table->foreignId('responded_by')->nullable()->constrained('users')->onDelete('set null');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('change_orders');
+    }
+};