feat: add app and database modules

app/Repositories/SystemSettingRepository.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace App\Repositories;
+
+use App\Models\SystemSetting;
+use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Support\Facades\Schema;
+
+class SystemSettingRepository
+{
+    public function tableExists(): bool
+    {
+        return Schema::hasTable('system_settings');
+    }
+
+    public function all(): Collection
+    {
+        return SystemSetting::query()->get();
+    }
+
+    public function allPublic(): Collection
+    {
+        return SystemSetting::query()->where('is_public', true)->get();
+    }
+
+    public function findByKey(string $key): ?SystemSetting
+    {
+        return SystemSetting::query()->where('key', $key)->first();
+    }
+
+    public function upsert(array $payload): SystemSetting
+    {
+        /** @var SystemSetting $setting */
+        $setting = SystemSetting::query()->updateOrCreate(
+            ['key' => $payload['key']],
+            [
+                'value' => $payload['value'],
+                'type' => $payload['type'],
+                'group' => $payload['group'],
+                'is_public' => $payload['is_public'],
+                'description' => $payload['description'] ?? null,
+                'created_by' => $payload['created_by'] ?? null,
+                'updated_by' => $payload['updated_by'] ?? null,
+            ]
+        );
+
+        return $setting;
+    }
+}