Init: Hoan thanh kien truc V3 va Filament UI

database/migrations/2025_01_04_000000_create_contracts_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('contracts', function (Blueprint $table) {
+            $table->uuid('id')->primary();
+            $table->foreignUuid('product_id')->constrained('products')->cascadeOnDelete();
+            $table->integer('transfer_order')->default(0); 
+            $table->string('contract_type')->default('HĐMB');
+            $table->string('contract_number')->unique();
+            $table->date('signing_date')->nullable();
+            $table->string('status')->default('Đang hiệu lực');
+            $table->decimal('total_value', 15, 2);
+            $table->decimal('paid_amount', 15, 2)->default(0);
+            // Cột ảo tự động tính số tiền còn lại, dev không cần query tính toán
+            $table->decimal('remaining_amount', 15, 2)->virtualAs('total_value - paid_amount');
+            $table->jsonb('metadata')->nullable();
+            $table->timestamps();
+        });
+    }
+    public function down(): void { Schema::dropIfExists('contracts'); }
+};