feat: upload wizard refactor + vision AI tags + artwork versioning

Upload wizard:
- Refactored UploadWizard into modular steps (Step1FileUpload, Step2Details, Step3Publish)
- Extracted reusable hooks: useUploadMachine, useFileValidation, useVisionTags
- Extracted reusable components: CategorySelector, ContentTypeSelector
- Added TagPicker component (studio-style list picker with AI badge + new-tag insertion)
- Fixed TagInput auto-open bug (hasFocusedRef guard)
- Replaced TagInput with TagPicker in UploadSidebar

Vision AI tag suggestions:
- Add UploadVisionSuggestController: sync POST /api/uploads/{id}/vision-suggest
- Calls vision.klevze.net/analyze/all on upload completion (before step 2 opens)
- Two-phase useVisionTags: immediate gateway call + background DB polling
- Trigger fires on uploadReady (not step change) so tags arrive before user sees step 2
- Added vision.gateway config block with VISION_GATEWAY_URL env

Artwork versioning system:
- ArtworkVersion / ArtworkVersionEvent models
- ArtworkVersioningService: createNewVersion, restoreVersion, rate limiting, ranking decay
- Migrations: artwork_versions, artwork_version_events, versioning columns on artworks
- Studio API routes: GET versions, POST restore/{version_id}
- Feature tests: ArtworkVersioningTest (13 cases)

database/migrations/2026_03_01_000001_create_artwork_versions_table.php

@@ -0,0 +1,36 @@
+<?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('artwork_versions', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('artwork_id')->index();
+
+            $table->unsignedInteger('version_number');
+            $table->string('file_path');
+            $table->string('file_hash', 64);
+            $table->unsignedInteger('width')->nullable();
+            $table->unsignedInteger('height')->nullable();
+            $table->unsignedBigInteger('file_size')->nullable();
+            $table->text('change_note')->nullable();
+            $table->boolean('is_current')->default(false);
+            $table->timestamps();
+
+            $table->foreign('artwork_id', 'fk_artwork_versions_artwork')
+                ->references('id')->on('artworks')->cascadeOnDelete();
+
+            $table->unique(['artwork_id', 'version_number'], 'uq_artwork_version');
+            $table->index(['artwork_id', 'is_current'], 'idx_artwork_version_current');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('artwork_versions');
+    }
+};

database/migrations/2026_03_01_000002_add_versioning_columns_to_artworks_table.php

@@ -0,0 +1,37 @@
+<?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('artworks', function (Blueprint $table) {
+            // FK to the active version row (nullable – set after first version is created)
+            $table->unsignedBigInteger('current_version_id')->nullable()->index()->after('hash');
+
+            // Running count of how many versions exist
+            $table->unsignedInteger('version_count')->default(1)->after('current_version_id');
+
+            // Last time the file was replaced
+            $table->timestamp('version_updated_at')->nullable()->after('version_count');
+
+            // Signals that a moderator must approve the new file
+            $table->boolean('requires_reapproval')->default(false)->after('version_updated_at');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('artworks', function (Blueprint $table) {
+            $table->dropIndex(['current_version_id']);
+            $table->dropColumn([
+                'current_version_id',
+                'version_count',
+                'version_updated_at',
+                'requires_reapproval',
+            ]);
+        });
+    }
+};

database/migrations/2026_03_01_000003_create_artwork_version_events_table.php

@@ -0,0 +1,29 @@
+<?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('artwork_version_events', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('artwork_id')->index();
+            $table->unsignedBigInteger('user_id')->index();
+            $table->string('action', 50); // create_version | restore_version
+            $table->unsignedBigInteger('version_id')->nullable();
+            $table->timestamps();
+
+            $table->foreign('artwork_id', 'fk_avevt_artwork')
+                ->references('id')->on('artworks')->cascadeOnDelete();
+            $table->foreign('user_id', 'fk_avevt_user')
+                ->references('id')->on('users')->cascadeOnDelete();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('artwork_version_events');
+    }
+};