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)

resources/js/components/upload/UploadSidebar.jsx

@@ -1,5 +1,5 @@
 import React from 'react'
-import TagInput from '../tags/TagInput'
+import TagPicker from '../tags/TagPicker'
 import Checkbox from '../../Components/ui/Checkbox'
 
 export default function UploadSidebar({
@@ -62,16 +62,14 @@ export default function UploadSidebar({
             <h4 className="text-sm font-semibold text-white">Tags</h4>
             <p className="mt-1 text-xs text-white/60">Use keywords people would search for. Press Enter, comma, or Tab to add a tag.</p>
           </div>
-          <TagInput
+          <TagPicker
             value={metadata.tags}
             onChange={(nextTags) => onChangeTags?.(nextTags)}
             suggestedTags={suggestedTags}
             maxTags={15}
-            minLength={2}
-            maxLength={32}
             searchEndpoint="/api/tags/search"
             popularEndpoint="/api/tags/popular"
-            placeholder="Type tags (e.g. cyberpunk, city)"
+            error={errors.tags}
           />
         </section>