feat(aether): initial commit – self-hosted Cloud, Phasen 1–7

Go-Backend (chi, pgx, golang-migrate) + React/TS-Frontend als PWA.
Enthalten: Auth inkl. OIDC, Dateien mit Versionen und Papierkorb,
Freigaben (Links + intern), WebDAV, Gruppenordner, Admin/Theming,
Volltextsuche mit OCR, eigener PDF-Betrachter und WOPI-Office
(Collabora/OnlyOffice).

Nicht im Repo: deploy/.env (Sitzungsschlüssel, DB- und Admin-Passwort)
sowie alle Daten- und Build-Verzeichnisse – siehe .gitignore.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

frontend/src/components/UploadQueue.tsx

@@ -0,0 +1,57 @@
+interface UploadItem {
+  id: string
+  name: string
+  progress: number // 0-100
+  status: 'uploading' | 'done' | 'error'
+  error?: string
+}
+
+interface Props {
+  items: UploadItem[]
+  onDismiss: (id: string) => void
+}
+
+export type { UploadItem }
+
+export default function UploadQueue({ items, onDismiss }: Props) {
+  if (items.length === 0) return null
+
+  return (
+    <div className="fixed bottom-4 right-4 w-72 space-y-2 z-40">
+      {items.map(item => (
+        <div
+          key={item.id}
+          className="rounded-xl p-3 text-sm shadow-lg border"
+          style={{ background: 'var(--color-surface)', borderColor: 'var(--color-border)' }}>
+          <div className="flex items-center justify-between mb-1.5">
+            <span className="truncate font-medium text-xs" style={{ color: 'var(--color-text)', maxWidth: 180 }}>
+              {item.name}
+            </span>
+            {item.status !== 'uploading' && (
+              <button onClick={() => onDismiss(item.id)}
+                      className="ml-2 opacity-50 hover:opacity-100 text-xs shrink-0"
+                      style={{ color: 'var(--color-text-muted)' }}>✕</button>
+            )}
+          </div>
+
+          {item.status === 'uploading' && (
+            <div className="h-1.5 rounded-full overflow-hidden" style={{ background: 'var(--color-surface-2)' }}>
+              <div
+                className="h-full rounded-full transition-all"
+                style={{
+                  width: `${item.progress}%`,
+                  background: 'linear-gradient(90deg, var(--color-primary), var(--color-accent))',
+                }} />
+            </div>
+          )}
+          {item.status === 'done' && (
+            <p style={{ color: 'var(--color-success)' }} className="text-xs">✓ Uploaded</p>
+          )}
+          {item.status === 'error' && (
+            <p style={{ color: 'var(--color-danger)' }} className="text-xs truncate">✕ {item.error}</p>
+          )}
+        </div>
+      ))}
+    </div>
+  )
+}