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/routes/sync.py

@@ -15,9 +15,7 @@ router = APIRouter(prefix="/api/sync", tags=["sync"])
 
 
 @router.post("/subscriptions")
-def sync_subscriptions(
-    user: User = Depends(require_human), db: Session = Depends(get_db)
-) -> dict:
+def sync_subscriptions(user: User = Depends(require_human), db: Session = Depends(get_db)) -> dict:
     if not has_read_scope(user):
         # No YouTube read grant yet — the onboarding wizard hasn't been completed.
         raise HTTPException(
@@ -32,13 +30,9 @@ def sync_subscriptions(
 
 
 @router.get("/status")
-def sync_status(
-    user: User = Depends(current_user), db: Session = Depends(get_db)
-) -> dict:
+def sync_status(user: User = Depends(current_user), db: Session = Depends(get_db)) -> dict:
     sub_count = db.scalar(
-        select(func.count())
-        .select_from(Subscription)
-        .where(Subscription.user_id == user.id)
+        select(func.count()).select_from(Subscription).where(Subscription.user_id == user.id)
     )
     return {
         "subscriptions": sub_count,
@@ -58,13 +52,9 @@ def sync_status(
 
 
 @router.get("/my-status")
-def my_status(
-    user: User = Depends(current_user), db: Session = Depends(get_db)
-) -> dict:
+def my_status(user: User = Depends(current_user), db: Session = Depends(get_db)) -> dict:
     """Per-user sync progress: how far the channels *this* user subscribes to have synced."""
-    sub_join = and_(
-        Subscription.channel_id == Channel.id, Subscription.user_id == user.id
-    )
+    sub_join = and_(Subscription.channel_id == Channel.id, Subscription.user_id == user.id)
     total, details_synced, recent_synced, deep_done = db.execute(
         select(
             func.count(Channel.id),
@@ -134,9 +124,7 @@ def deep_all(
 ) -> dict:
     """Opt every one of the user's channels into (or out of) full-history backfill."""
     result = db.execute(
-        update(Subscription)
-        .where(Subscription.user_id == user.id)
-        .values(deep_requested=on)
+        update(Subscription).where(Subscription.user_id == user.id).values(deep_requested=on)
     )
     db.commit()
     return {"updated": result.rowcount, "deep_requested": on}