wp-init: provision fluent plugins via WP_EXTRA_PLUGINS

gustavoo-portfolio-core refuses to activate without fluentform, fluent-crm
and fluent-smtp, but those were gitignored and not installed by the setup:
any fresh clone ended with the core plugin inactive and the seeder skipped.
They are now part of the default WP_EXTRA_PLUGINS (verified slugs on
WordPress.org), with .env.example, compose default, README and .gitignore
updated to match.

docker/wp-init.sh

@@ -23,7 +23,10 @@ WP_LOCALE="${WP_LOCALE:-pt_BR}"
 # Plugins from the WordPress.org directory that must exist even when they are
 # not committed to wp-content/plugins. Installed only when missing, then
 # activated. Format: slug (or URL).
-WP_EXTRA_PLUGINS="${WP_EXTRA_PLUGINS:-post-views-counter seo-by-rank-math google-site-kit}"
+# fluentform, fluent-crm and fluent-smtp are required by gustavoo-portfolio-core
+# (contact forms, CRM feeds, SMTP); without them the core plugin refuses to
+# activate and the seeder never runs.
+WP_EXTRA_PLUGINS="${WP_EXTRA_PLUGINS:-post-views-counter seo-by-rank-math google-site-kit fluentform fluent-crm fluent-smtp}"
 
 wp_run() {
   wp --path="$WP_PATH" "$@"