Implements createFromWizard and createFromUpload service paths covering
the documenso-template, in-app, and upload pathways. Persists subject
FK, signers, watchers, and the per-document reminder controls
(remindersDisabled / reminderCadenceOverride) introduced in PR1. New
POST /api/v1/documents/wizard route and a functional /documents/new UI
with type/source/template/signers/reminders sections. Drag-handle
reorder, watcher autocomplete picker, and PDF preview defer to the
PR10 polish sweep.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>