add more controllers and fix tests

database/migrations/2026_03_09_070000_create_suppliers_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('suppliers', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('suppliers');
+    }
+};

database/migrations/2026_03_09_070010_create_supplies_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('supplies', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->string('unit')->nullable();
+            $table->integer('qty_on_hand')->default(0);
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('supplies');
+    }
+};

database/migrations/2026_03_09_070020_create_supply_transactions_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('supply_transactions', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('supply_id');
+            $table->string('type', 10);
+            $table->integer('quantity');
+            $table->string('ref')->nullable();
+            $table->string('issued_to')->nullable();
+            $table->string('issued_by')->nullable();
+            $table->text('notes')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('supply_transactions');
+    }
+};

database/migrations/2026_03_09_070030_create_purchase_orders_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('purchase_orders', function (Blueprint $table) {
+            $table->id();
+            $table->string('po_number')->nullable();
+            $table->unsignedBigInteger('supplier_id')->nullable();
+            $table->string('status', 20)->default('ordered');
+            $table->date('order_date')->nullable();
+            $table->date('expected_date')->nullable();
+            $table->decimal('subtotal', 10, 2)->default(0);
+            $table->decimal('tax', 10, 2)->default(0);
+            $table->decimal('total', 10, 2)->default(0);
+            $table->text('notes')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('purchase_orders');
+    }
+};

database/migrations/2026_03_09_070040_create_purchase_order_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
+{
+    public function up(): void
+    {
+        Schema::create('purchase_order_items', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('purchase_order_id');
+            $table->unsignedBigInteger('supply_id');
+            $table->string('description')->nullable();
+            $table->integer('quantity');
+            $table->integer('received_qty')->default(0);
+            $table->decimal('unit_cost', 10, 2)->default(0);
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('purchase_order_items');
+    }
+};