feat(purchase): add Purchase and PurchaseItem models with migrations for compras and compra_items tables

app/Domains/Purchase/Models/Purchase.php

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+<?php
+
+namespace App\Domains\Purchase\Models;
+
+use App\Domains\Tenant\Models\Tenant;
+use App\Models\User;
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+#[Fillable([
+    'tenant_codigo',
+    'user_id',
+    'status',
+    'payment_status',
+    'payment_method',
+])]
+class Purchase extends Model
+{
+    use HasFactory;
+
+    protected $table = 'compras';
+
+    protected function casts(): array
+    {
+        return [
+            'user_id' => 'integer',
+        ];
+    }
+
+    /**
+     * @return BelongsTo<Tenant, $this>
+     */
+    public function tenant(): BelongsTo
+    {
+        return $this->belongsTo(Tenant::class, 'tenant_codigo', 'codigo');
+    }
+
+    /**
+     * @return BelongsTo<User, $this>
+     */
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    /**
+     * @return HasMany<PurchaseItem, $this>
+     */
+    public function items(): HasMany
+    {
+        return $this->hasMany(PurchaseItem::class, 'compra_id');
+    }
+}

app/Domains/Purchase/Models/PurchaseItem.php

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+<?php
+
+namespace App\Domains\Purchase\Models;
+
+use App\Domains\Catalog\Models\ProductVariant;
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+#[Fillable([
+    'compra_id',
+    'producto_variante_id',
+    'cantidad',
+    'precio_unitario',
+    'discount_total',
+    'tax_total',
+    'total',
+])]
+class PurchaseItem extends Model
+{
+    use HasFactory;
+
+    protected $table = 'compra_items';
+
+    protected function casts(): array
+    {
+        return [
+            'compra_id' => 'integer',
+            'producto_variante_id' => 'integer',
+            'cantidad' => 'integer',
+            'precio_unitario' => 'decimal:2',
+            'discount_total' => 'decimal:2',
+            'tax_total' => 'decimal:2',
+            'total' => 'decimal:2',
+        ];
+    }
+
+    /**
+     * @return BelongsTo<Purchase, $this>
+     */
+    public function purchase(): BelongsTo
+    {
+        return $this->belongsTo(Purchase::class, 'compra_id');
+    }
+
+    /**
+     * @return BelongsTo<ProductVariant, $this>
+     */
+    public function variant(): BelongsTo
+    {
+        return $this->belongsTo(ProductVariant::class, 'producto_variante_id');
+    }
+}

database/migrations/2026_06_25_000420_create_compras_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
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('compras', function (Blueprint $table) {
+            $table->id();
+            $table->string('tenant_codigo');
+            $table->foreignId('user_id')->nullable()->constrained('users')->cascadeOnUpdate()->nullOnDelete();
+            $table->enum('status', ['pending', 'paid', 'cancelled'])->default('pending');
+            $table->enum('payment_status', ['pending', 'approved', 'rejected'])->default('pending');
+            $table->string('payment_method')->nullable();
+            $table->timestamps();
+
+            $table->foreign('tenant_codigo')
+                ->references('codigo')
+                ->on('tenants')
+                ->cascadeOnUpdate()
+                ->restrictOnDelete();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('compras');
+    }
+};

database/migrations/2026_06_25_000430_create_compra_items_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
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('compra_items', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('compra_id')->constrained('compras')->cascadeOnUpdate()->cascadeOnDelete();
+            $table->unsignedBigInteger('producto_variante_id');
+            $table->unsignedInteger('cantidad');
+            $table->decimal('precio_unitario', 10, 2);
+            $table->decimal('discount_total', 10, 2)->nullable();
+            $table->decimal('tax_total', 10, 2)->nullable();
+            $table->decimal('total', 10, 2);
+            $table->timestamps();
+
+            $table->foreign('producto_variante_id')
+                ->references('id')
+                ->on('productos_variantes')
+                ->cascadeOnUpdate()
+                ->restrictOnDelete();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('compra_items');
+    }
+};