fe_comment v2: FE-user feedback tickets with summary, uploads and API

- Replace the v1 submit endpoint with a full JSON API under
  /api/fe-comment/ (state, feedback create/update/delete, uploads,
  summary notes/recipients, submit), guarded by frontend login and a
  configurable FE user group; unauthorized callers get {"allowed":false}
- New models: tx_fecomment_summary (one open ticket per user, status
  open/sent) and tx_fecomment_feedback (url, RTE note, FAL attachments),
  both editable in the backend on the ticket storage page
- FeedbackApiMiddleware registered after frontend authentication (the
  frontend.user attribute does not exist earlier); uploads land in
  fileadmin/fe_comment/summary-<uid>/ with mime/extension check, 20 MB cap
- Submit sends one HTML mail (author block, items with attachment links,
  reply-to = FE user mail) to selected recipients with mailTo fallback,
  then closes the summary
- felogin wired React-compatible: felogin.pid=520 plus headless FeLogin
  JSON templates via site settings - felogin v14 and EXT:headless both
  claim templateRootPaths.10, the felogin.view.* settings feed exactly
  that index, so the structured JSON form (incl. __RequestToken) wins
- Read the sys_file_reference insert id before syncAttachmentCount():
  DBAL throws "no identity value" once the count UPDATE has run
- migrations: drop_fecomment_tables.php (repairs the no-uid tables,
  only drops when empty), check_feuser.php (login diagnosis),
  fec_login_test.sh / fec_api_test.sh (curl chains incl. CSRF token flow)

packages/fe_comment/Configuration/TCA/tx_fecomment_feedback.php

@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * One feedback item (page URL + rich-text note + attachments), owned by a
+ * FE user, belonging to a summary. Written from the front end.
+ */
+return [
+    'ctrl' => [
+        'title' => 'Feedback',
+        'label' => 'url',
+        'tstamp' => 'tstamp',
+        'crdate' => 'crdate',
+        'delete' => 'deleted',
+        'sortby' => 'sorting',
+        'hideTable' => true,
+        'iconfile' => 'EXT:fe_comment/Resources/Public/Icons/Extension.svg',
+        'security' => ['ignorePageTypeRestriction' => true],
+    ],
+    'types' => [
+        '1' => ['showitem' => 'url, note, attachments, fe_user'],
+    ],
+    'columns' => [
+        'summary' => [
+            'config' => ['type' => 'passthrough'],
+        ],
+        'fe_user' => [
+            'label' => 'Author (frontend user)',
+            'config' => ['type' => 'group', 'allowed' => 'fe_users', 'maxitems' => 1, 'size' => 1],
+        ],
+        'url' => [
+            'label' => 'Page URL',
+            'config' => ['type' => 'input', 'size' => 50, 'max' => 2048],
+        ],
+        'note' => [
+            'label' => 'Note',
+            'config' => ['type' => 'text', 'rows' => 6, 'enableRichtext' => true],
+        ],
+        'attachments' => [
+            'label' => 'Attachments',
+            'config' => [
+                'type' => 'file',
+                'maxitems' => 20,
+            ],
+        ],
+    ],
+];