fix: proper multi-user tag badges using full Emby user list

Server:
- Add getEmbyUsers(): fetches all Emby users, builds Map of
  lowercase/sanitized name -> display name, cached 60s
- Add buildTagBadges(allTags, embyUserMap): classifies each tag
  as { label, matchedUser: displayName|null } against the full
  Emby user database
- Attach tagBadges[] to every download object when showAll=true
  (all 10 construction sites across SABnzbd queue/history and
  qBittorrent queue/history blocks)
- matchedUserTag still set to the tag matching the *current* user
  for the non-showAll badge

Frontend:
- showAll mode: renders tagBadges[] — unmatched tags (no Emby user)
  amber leftmost, matched tags show Emby display name in accent
  colour rightmost
- Normal mode: renders matchedUserTag badge only (current user's tag)

public/app.js

@@ -434,16 +434,26 @@ function createDownloadCard(download) {
     infoDiv.appendChild(movie);
   }
 
-  if (showAll && download.allTags && download.allTags.length > 0) {
-    const unmatchedTags = download.allTags.filter(t => t !== download.matchedUserTag);
-    for (const tag of unmatchedTags) {
+  if (showAll && download.tagBadges && download.tagBadges.length > 0) {
+    // In showAll mode: render all tags classified by whether they match an Emby user.
+    // Unmatched (no known Emby user) → amber, leftmost.
+    // Matched → show Emby display name in accent colour, rightmost.
+    const unmatched = download.tagBadges.filter(b => !b.matchedUser);
+    const matched = download.tagBadges.filter(b => b.matchedUser);
+    for (const b of unmatched) {
       const badge = document.createElement('span');
       badge.className = 'download-user-badge unmatched';
-      badge.textContent = tag;
+      badge.textContent = b.label;
       header.appendChild(badge);
     }
-  }
-  if (download.matchedUserTag) {
+    for (const b of matched) {
+      const badge = document.createElement('span');
+      badge.className = 'download-user-badge';
+      badge.textContent = b.matchedUser;
+      header.appendChild(badge);
+    }
+  } else if (download.matchedUserTag) {
+    // Normal (non-showAll) view: show only the current user's matched tag
     const matchedBadge = document.createElement('span');
     matchedBadge.className = 'download-user-badge';
     matchedBadge.textContent = download.matchedUserTag;