feat: implement repository architecture with smart caching

- Add base repository interfaces and abstract classes
  - Implement separated read/write repositories for Domain and Username models
  - Add intelligent query caching with automatic invalidation
  - Include cache management service and CLI commands
  - Add comprehensive configuration for cache TTL and monitoring
  - Enhance performance through optimized data access patterns

app/Console/Commands/ClearRepositoryCache.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Services\CacheService;
+use Illuminate\Console\Command;
+
+class ClearRepositoryCache extends Command
+{
+    protected $signature = 'repo:cache:clear
+                            {repository? : The repository to clear (domains, usernames, or all)}
+                            {--force : Force clear without confirmation}';
+
+    protected $description = 'Clear repository cache';
+
+    public function __construct(
+        protected CacheService $cacheService
+    ) {
+        parent::__construct();
+    }
+
+    public function handle(): int
+    {
+        $repository = $this->argument('repository');
+
+        if (! $repository || $repository === 'all') {
+            if (! $this->option('force') && ! $this->confirm('Clear all repository cache?')) {
+                $this->info('Cache clearing cancelled.');
+
+                return Command::SUCCESS;
+            }
+
+            $this->info('Clearing all repository cache...');
+            $this->cacheService->clearAllRepositoryCache();
+            $this->info('All repository cache cleared successfully.');
+        } else {
+            $this->info("Clearing cache for {$repository} repository...");
+            $this->cacheService->clearRepositoryCache($repository);
+            $this->info("{$repository} repository cache cleared successfully.");
+        }
+
+        return Command::SUCCESS;
+    }
+}