feat: expand companion platform, device controls, and memoir workflows

Add customer and operator login, BLE provisioning, device fleet controls, call memory, memoir generation, and refreshed family and maintenance portals. Include API contracts, migrations, firmware sources, tests, assets, and deployment documentation.

migrations/000077_memoirs.down.sql

@@ -0,0 +1,3 @@
+-- A rollback cannot safely restore the one-story-per-call uniqueness after
+-- real multi-event stories exist. Roll back the release using a DB snapshot.
+DO $$ BEGIN RAISE EXCEPTION 'Memoir migration requires a pre-migration snapshot to roll back'; END $$;