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

TODO.md

@@ -1,4 +1,14 @@
-# FilePond Server-ID Refactor
+# FilePond Refactor — Merge video/audio into TFE pool
+
+- [x] A. `fichiers-fragment.php` — Remove separate video/audio pools, merge into TFE; include PeerTube in data-existing-files
+- [x] B. `file-upload-filepond.js` — Remove peertube_video/peertube_audio/video/audio from QUEUE_CONFIG, remove acceptedFileTypesPeerTube, remove data-peertube-active logic
+- [x] C. `process.php` — When queue_type=tfe and video/audio + PeerTube enabled, upload to PeerTube, return peertube:UUID
+- [x] D. `load.php` — Handle peertube DB files: return placeholder SVG blob
+- [x] E. `form.php` — Include PeerTube files in existingFilesJsonForTfe for edit mode
+- [x] F. `ThesisEditController.php` — Remove separate video/audio/peertube_* handleFilePondQueueFiles calls; also legacy $_FILES path
+- [x] G. `ThesisCreateController.php` — Same as F
+
+## Previous items
 
 - [x] Step 1 — Build 4 PHP endpoints (process.php, revert.php, load.php, remove.php)
 - [x] Step 2 — Update ThesisFileHandler to accept file_ids instead of $_FILES