Pure moves, no behaviour change: the storage layer now has users,
apikeys, thoughts, tasklists, documents, folders, tags, lists, teams and
system files next to sqlite.go (store, schema, migrations); the API has
handlers_*.go per area plus realtime.go and alarms.go next to server.go
(server, router, middleware). Declarations were moved verbatim with an
AST-based tool; imports pruned with goimports.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
