Init: Hoan thanh kien truc V3 va Filament UI

database/migrations/2025_01_06_000000_create_appendices_table.php

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+<?php
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+return new class extends Migration {
+    public function up(): void {
+        Schema::create('appendices', function (Blueprint $table) {
+            $table->uuid('id')->primary();
+            $table->foreignUuid('contract_id')->constrained('contracts')->cascadeOnDelete();
+            $table->foreignUuid('product_id')->constrained('products')->cascadeOnDelete();
+            $table->string('type');
+            $table->integer('apply_from_order')->default(0);
+            $table->date('signing_date')->nullable();
+            $table->jsonb('custom_data')->nullable();
+            $table->timestamps();
+        });
+    }
+    public function down(): void { Schema::dropIfExists('appendices'); }
+};