Implement creator studio and upload updates

tests/Feature/Artworks/ArtworkCreatedAtSyncTest.php

@@ -0,0 +1,49 @@
+<?php
+
+use App\Models\Artwork;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Carbon;
+use Illuminate\Support\Facades\Artisan;
+use Illuminate\Support\Facades\DB;
+
+uses(RefreshDatabase::class);
+
+it('copies published_at into created_at when an artwork is published', function () {
+    $user = User::factory()->create();
+
+    $artwork = Artwork::factory()->unpublished()->create([
+        'user_id' => $user->id,
+        'created_at' => Carbon::parse('2026-03-01 10:00:00'),
+        'updated_at' => Carbon::parse('2026-03-01 10:00:00'),
+    ]);
+
+    $publishedAt = Carbon::parse('2026-03-29 14:30:00');
+
+    $artwork->forceFill([
+        'published_at' => $publishedAt,
+        'artwork_status' => 'published',
+        'is_public' => true,
+        'is_approved' => true,
+    ])->save();
+
+    $artwork->refresh();
+
+    expect($artwork->created_at?->toDateTimeString())->toBe($publishedAt->toDateTimeString());
+    expect(DB::table('user_statistics')->where('user_id', $user->id)->value('last_upload_at'))->toBe($publishedAt->toDateTimeString());
+});
+
+it('syncs created_at from published_at for existing artworks via command', function () {
+    $artwork = Artwork::factory()->create([
+        'created_at' => Carbon::parse('2026-03-01 10:00:00'),
+        'updated_at' => Carbon::parse('2026-03-01 10:00:00'),
+        'published_at' => Carbon::parse('2026-03-25 08:15:00'),
+    ]);
+
+    $exitCode = Artisan::call('artworks:sync-created-at');
+
+    expect($exitCode)->toBe(0);
+
+    $createdAt = DB::table('artworks')->where('id', $artwork->id)->value('created_at');
+    expect(Carbon::parse($createdAt)->toDateTimeString())->toBe('2026-03-25 08:15:00');
+});