caddyfile: apply caddy fmt — silence "input is not formatted" warning

FrankenPHP logs a warning on every boot:

  Caddyfile input is not formatted; run 'caddy fmt --overwrite' to
  fix inconsistencies

Cosmetic but clutters the dev console (and the bundled-mode logs).
The actual diff is one blank line in each file: caddy fmt rejects an
empty line between a leading comment and the `{` global-options
block. tests/var/Caddyfile was already clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

examples/todo/Caddyfile

@@ -4,7 +4,6 @@
 #   - dev mode      → env unset, defaults below match symfony/.env
 #   - bundled mode  → BackendConnection sets PORT and MERCURE_*_JWT_KEY
 #                     before launching FrankenPHP.
-{
 {
 	auto_https off
 	admin off