refactor: merge video/audio FilePond pools into TFE input

- Remove separate video/audio/peertube_video/peertube_audio pools from UI
- TFE pool now accepts all file types including video/audio
- When PeerTube is enabled, video/audio dropped into TFE pool auto-upload
  to PeerTube (process.php detects MIME and uploads immediately)
- PeerTube return IDs now encode type: peertube:video:UUID or peertube:audio:UUID
- load.php returns placeholder SVG for PeerTube files so they appear in FilePond
- Edit mode: all existing files (including PeerTube) shown in TFE FilePond pool
- Remove legacy  video/audio/peertube_* handling from both controllers
- Remove unused vide/audio/peertube_* entries from JS QUEUE_CONFIG

app/src/Controllers/ThesisFileHandler.php

@@ -1001,16 +1001,18 @@ trait ThesisFileHandler
             }
 
             // PeerTube files have been uploaded already; just insert DB row
+            // Format: peertube:video:UUID or peertube:audio:UUID
             if (str_starts_with($fileId, 'peertube:')) {
-                $uuid = substr($fileId, strlen('peertube:'));
-                $fileType = ($queueKey === 'peertube_video') ? 'video' : 'audio';
+                $parts = explode(':', $fileId, 3);
+                $fileType = ($parts[1] ?? '') === 'video' ? 'video' : 'audio';
+                $uuid = $parts[2] ?? '';
                 $storedPath = 'peertube_ids:' . $uuid;
                 $this->db->insertThesisFile(
                     $thesisId, $fileType,
                     $storedPath,
                     $uuid . ' (PeerTube)',
                     0,
-                    ($queueKey === 'peertube_video') ? 'video/mp4' : 'audio/mpeg',
+                    $fileType === 'video' ? 'video/mp4' : 'audio/mpeg',
                     null, null
                 );
                 error_log("ThesisFileHandler: PeerTube file associated → $uuid");