Fix FB integration not picked up + OO mixed content behind HTTPS proxy

- SyncFileBrowserMounts: use --force-recreate so FB always picks up
  config.yaml changes (bind mount not detected by docker compose up)
- OnlyOffice compose template: add Traefik middleware to forward
  X-Forwarded-Proto=https (fixes mixed content errors in browser)
- Nextcloud handler: add StorageUrl=http://nextcloud for internal
  file download callbacks from OO Document Server

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

controller/internal/integrations/onlyoffice_nextcloud.go

@@ -49,6 +49,10 @@ func (h *OnlyOfficeNextcloudHandler) Apply(ac *ApplyContext) error {
 		{
 			args: []string{"docker", "exec", "-u", "www-data", "nextcloud", "php", "occ", "config:app:set", "onlyoffice", "jwt_secret", "--value=" + jwtSecret},
 		},
+		{
+			// StorageUrl: tells OO Document Server where to reach Nextcloud internally for file callbacks
+			args: []string{"docker", "exec", "-u", "www-data", "nextcloud", "php", "occ", "config:app:set", "onlyoffice", "StorageUrl", "--value=http://nextcloud"},
+		},
 	}
 
 	for _, cmd := range commands {