style: apply ruff format across backend + scripts (line-length 100)

Mechanical, whole-tree `ruff format` pass — no behaviour change. Recorded in
.git-blame-ignore-revs (next commit) so git blame skips it.

backend/app/state.py

@@ -1,4 +1,5 @@
 """Global admin-controlled app state (e.g. pausing background sync, first-run setup)."""
+
 import logging
 import secrets
 
@@ -39,6 +40,7 @@ def set_sync_paused(db: Session, paused: bool) -> None:
 
 # --- First-run install wizard ------------------------------------------------------------
 
+
 def is_configured(db: Session) -> bool:
     return _row(db).configured