chore: add missing Purchase module migration files

Five Purchase migrations were untracked after Phase 7 commit:
po_vendors, po_rfqs, po_rfq_lines, pos, po_lines tables.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: claude

erp/database/migrations/2027_01_10_100010_create_purchase_vendors_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::dropIfExists('po_vendors');
+        Schema::create('po_vendors', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('tenant_id')->constrained('tenants')->cascadeOnDelete();
+            $table->string('name');
+            $table->string('email')->nullable();
+            $table->string('phone')->nullable();
+            $table->text('address')->nullable();
+            $table->string('currency')->default('USD');
+            $table->string('payment_terms')->nullable();
+            $table->boolean('is_active')->default(true);
+            $table->unsignedTinyInteger('rating')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('po_vendors');
+    }
+};

erp/database/migrations/2027_01_10_100011_create_purchase_rfqs_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::dropIfExists('po_rfqs');
+        Schema::create('po_rfqs', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('tenant_id')->constrained('tenants')->cascadeOnDelete();
+            $table->string('rfq_number');
+            $table->foreignId('po_vendor_id')->constrained('po_vendors')->cascadeOnDelete();
+            $table->enum('status', ['draft', 'sent', 'received', 'cancelled'])->default('draft');
+            $table->date('expected_delivery')->nullable();
+            $table->text('notes')->nullable();
+            $table->string('currency')->default('USD');
+            $table->timestamp('sent_at')->nullable();
+            $table->timestamps();
+
+            $table->unique(['tenant_id', 'rfq_number']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('po_rfqs');
+    }
+};

erp/database/migrations/2027_01_10_100012_create_purchase_rfq_lines_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::dropIfExists('po_rfq_lines');
+        Schema::create('po_rfq_lines', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('tenant_id')->constrained('tenants')->cascadeOnDelete();
+            $table->foreignId('po_rfq_id')->constrained('po_rfqs')->cascadeOnDelete();
+            $table->string('product_name');
+            $table->text('description')->nullable();
+            $table->decimal('quantity', 10, 3)->default(1);
+            $table->decimal('unit_price', 10, 2)->default(0);
+            $table->string('uom')->default('unit');
+            $table->decimal('subtotal', 10, 2)->default(0);
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('po_rfq_lines');
+    }
+};

erp/database/migrations/2027_01_10_100013_create_pos_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::dropIfExists('pos');
+        Schema::create('pos', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('tenant_id')->constrained('tenants')->cascadeOnDelete();
+            $table->string('po_number');
+            $table->foreignId('po_rfq_id')->nullable()->constrained('po_rfqs')->nullOnDelete();
+            $table->foreignId('po_vendor_id')->constrained('po_vendors')->cascadeOnDelete();
+            $table->enum('status', ['draft', 'confirmed', 'received', 'cancelled'])->default('draft');
+            $table->date('order_date');
+            $table->date('expected_delivery')->nullable();
+            $table->text('notes')->nullable();
+            $table->string('currency')->default('USD');
+            $table->decimal('total_amount', 12, 2)->default(0);
+            $table->timestamp('confirmed_at')->nullable();
+            $table->timestamp('received_at')->nullable();
+            $table->timestamps();
+
+            $table->unique(['tenant_id', 'po_number']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('pos');
+    }
+};

erp/database/migrations/2027_01_10_100014_create_po_lines_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::dropIfExists('po_lines');
+        Schema::create('po_lines', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('tenant_id')->constrained('tenants')->cascadeOnDelete();
+            $table->foreignId('po_id')->constrained('pos')->cascadeOnDelete();
+            $table->string('product_name');
+            $table->text('description')->nullable();
+            $table->decimal('quantity', 10, 3)->default(1);
+            $table->decimal('unit_price', 10, 2)->default(0);
+            $table->string('uom')->default('unit');
+            $table->decimal('subtotal', 10, 2)->default(0);
+            $table->decimal('received_qty', 10, 3)->default(0);
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('po_lines');
+    }
+};