add inventory and supply logic

database/migrations/2026_03_09_070050_create_supply_categories_table.php

@@ -0,0 +1,22 @@
+<?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_categories', function (Blueprint $table) {
+            $table->id();
+            $table->string('name')->unique();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('supply_categories');
+    }
+};

database/migrations/2026_03_09_070060_add_fields_to_suppliers_table.php

@@ -0,0 +1,44 @@
+<?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::table('suppliers', function (Blueprint $table) {
+            if (!Schema::hasColumn('suppliers', 'email')) {
+                $table->string('email')->nullable()->after('name');
+            }
+            if (!Schema::hasColumn('suppliers', 'phone')) {
+                $table->string('phone')->nullable()->after('email');
+            }
+            if (!Schema::hasColumn('suppliers', 'address')) {
+                $table->string('address')->nullable()->after('phone');
+            }
+            if (!Schema::hasColumn('suppliers', 'notes')) {
+                $table->text('notes')->nullable()->after('address');
+            }
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('suppliers', function (Blueprint $table) {
+            if (Schema::hasColumn('suppliers', 'notes')) {
+                $table->dropColumn('notes');
+            }
+            if (Schema::hasColumn('suppliers', 'address')) {
+                $table->dropColumn('address');
+            }
+            if (Schema::hasColumn('suppliers', 'phone')) {
+                $table->dropColumn('phone');
+            }
+            if (Schema::hasColumn('suppliers', 'email')) {
+                $table->dropColumn('email');
+            }
+        });
+    }
+};