Init: Hoan thanh kien truc V3 va Filament UI

database/migrations/2025_01_07_000000_create_settlements_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('settlements', function (Blueprint $table) {
+            $table->uuid('id')->primary();
+            $table->foreignUuid('product_id')->constrained('products')->cascadeOnDelete();
+            $table->string('type'); // "MÓNG", "THÂN", "CP THI CÔNG"
+            $table->decimal('temp_value', 15, 2)->default(0);
+            $table->decimal('final_value', 15, 2)->default(0);
+            $table->decimal('difference', 15, 2)->virtualAs('final_value - temp_value');
+            $table->string('red_book_status')->nullable();
+            $table->date('issue_date')->nullable();
+            $table->timestamps();
+        });
+    }
+    public function down(): void { Schema::dropIfExists('settlements'); }
+};