add permission scanner, info panels, image QR scan, invite tracker, ticket templates

Five new features:
- /permissions scan: audits admin/ban roles, dangerous bot permissions,
  public channels, empty/duplicate/useless roles, too-many-admins warning.
- /panel create: fixed info panels (rules/support/bewerbung/partner/
  rollen/events/faq) with buttons wired into the existing ticket/
  register/partner flows, FAQ panels get a question dropdown.
- Image moderation: QR-code detection in message attachments via jimp+jsqr
  (pure JS, no native build deps) with a small scam-pattern check; opt-in
  toggle in dashboard settings since decoding costs per-message.
- Invite tracker extension: now resolves the inviter (not just the code),
  tracks suspicious joins per invite, and the dashboard growth page gets
  an invite breakdown + recent-joins table.
- Ticket categories: /ticketconfig lets each ticket topic get its own
  ping role and a modal question template shown before the channel is
  created; topics without config behave exactly as before.

Also fixes two rough edges found along the way: the welcome embed had
no way to attach an image despite the backend already supporting it
(added URL/file-upload fields + live preview), and Reaction Roles
required typing raw role IDs into a textarea (replaced with a proper
role picker). Incidentally repairs node_modules/.bin symlinks that were
committed as literal broken shell-script text instead of real symlinks.

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

node_modules/.bin/rimraf

@@ -1,16 +1 @@
-#!/bin/sh
-basedir=$(dirname "$(echo "$0" | sed -e 's,\\,/,g')")
-
-case `uname` in
-    *CYGWIN*|*MINGW*|*MSYS*)
-        if command -v cygpath > /dev/null 2>&1; then
-            basedir=`cygpath -w "$basedir"`
-        fi
-    ;;
-esac
-
-if [ -x "$basedir/node" ]; then
-  exec "$basedir/node"  "$basedir/../rimraf/bin.js" "$@"
-else 
-  exec node  "$basedir/../rimraf/bin.js" "$@"
-fi
+../rimraf/bin.js