Mark omarchy-install-service-dropbox as requires-sudo

bin/omarchy scans the first 80 lines of every command for omarchy:* metadata. The requires-sudo flag is surfaced via 'omarchy commands --json', and the interactive launcher and menu use it to flag entries that need elevation before the user clicks them.

Every install-service script in bin/ has the directive: spotify, signal, 1password, sunshine, dropbox-remove, nordvpn, once, tailscale, plus the full omarchy-install-* and omarchy-apply-* trees. omarchy-remove-service-dropbox has it.

omarchy-install-service-dropbox is the outlier. The menu hints 'needs sudo' for removing Dropbox but not for installing it. The install path runs pacman via omarchy-pkg-add, which needs elevation. The missing directive is an oversight, not a deliberate choice.

bin/omarchy-install-service-dropbox

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 # omarchy:summary=Install and start the Dropbox service. Must then be authenticated via the web.
+# omarchy:requires-sudo=true
 
 echo "Installing all dependencies..."
 omarchy-pkg-add dropbox dropbox-cli libappindicator-gtk3 python-gpgme nautilus-dropbox