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/UploadPreview.jsx

@@ -15,9 +15,9 @@ export default function UploadPreview({
   invalid = false,
 }) {
   return (
-    <section className={`rounded-xl border bg-gradient-to-br p-5 shadow-[0_12px_32px_rgba(0,0,0,0.35)] transition-colors sm:p-6 ${invalid ? 'border-red-400/45 from-red-500/10 to-slate-900/45' : 'border-white/50 from-slate-900/80 to-slate-900/45'}`}>
+    <section className={`rounded-xl bg-gradient-to-br p-5 shadow-[0_12px_32px_rgba(0,0,0,0.35)] transition-colors sm:p-6 ${invalid ? 'ring-1 ring-red-400/40 from-red-500/10 to-slate-900/45' : 'ring-1 ring-white/10 from-slate-900/80 to-slate-900/45'}`}>
       {/* Intended props: file, previewUrl, isArchive, dimensions, fileSize, format, warning */}
-      <div className={`rounded-xl border p-4 transition-colors ${invalid ? 'border-red-300/45 bg-red-500/5' : 'border-white/50 bg-black/25'}`}>
+      <div className={`rounded-xl ring-1 p-4 transition-colors ${invalid ? 'ring-red-300/40 bg-red-500/5' : 'ring-white/8 bg-black/25'}`}>
         <div className="flex items-center justify-between gap-3">
           <h3 className="text-lg font-semibold text-white">{title}</h3>
           <span className="rounded-full border border-white/15 bg-white/5 px-2.5 py-1 text-[11px] text-white/65">