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/tests/test_plex_facets_grid_parity.py

@@ -11,6 +11,7 @@ That locks the two duplicated branch-sets together BEFORE they are merged into o
 the merge is provably behaviour-equivalent (and a drift between grid and facets fails here). DB lane
 (`db` fixture) — skipped without Postgres.
 """
+
 from collections import Counter
 from datetime import datetime, timezone
 
@@ -41,22 +42,78 @@ def _seed(db):
     db.flush()
 
     # Movies — new / in-progress / watched / hidden, with overlapping genres.
-    m_new = PlexItem(rating_key="m_new", library_id=movie_lib.id, kind="movie", title="New Movie",
-                     year=2001, added_at=_dt(1), genres=["Drama"], content_rating="PG")
-    m_prog = PlexItem(rating_key="m_prog", library_id=movie_lib.id, kind="movie", title="Prog Movie",
-                      year=2002, added_at=_dt(2), genres=["Drama", "Comedy"], content_rating="PG-13")
-    m_watch = PlexItem(rating_key="m_watch", library_id=movie_lib.id, kind="movie", title="Watched Movie",
-                       year=2003, added_at=_dt(3), genres=["Comedy"], content_rating="R")
-    m_hidden = PlexItem(rating_key="m_hidden", library_id=movie_lib.id, kind="movie", title="Hidden Movie",
-                        year=2004, added_at=_dt(4), genres=["Drama"], content_rating="R")
+    m_new = PlexItem(
+        rating_key="m_new",
+        library_id=movie_lib.id,
+        kind="movie",
+        title="New Movie",
+        year=2001,
+        added_at=_dt(1),
+        genres=["Drama"],
+        content_rating="PG",
+    )
+    m_prog = PlexItem(
+        rating_key="m_prog",
+        library_id=movie_lib.id,
+        kind="movie",
+        title="Prog Movie",
+        year=2002,
+        added_at=_dt(2),
+        genres=["Drama", "Comedy"],
+        content_rating="PG-13",
+    )
+    m_watch = PlexItem(
+        rating_key="m_watch",
+        library_id=movie_lib.id,
+        kind="movie",
+        title="Watched Movie",
+        year=2003,
+        added_at=_dt(3),
+        genres=["Comedy"],
+        content_rating="R",
+    )
+    m_hidden = PlexItem(
+        rating_key="m_hidden",
+        library_id=movie_lib.id,
+        kind="movie",
+        title="Hidden Movie",
+        year=2004,
+        added_at=_dt(4),
+        genres=["Drama"],
+        content_rating="R",
+    )
 
     # Shows — new / in-progress / watched (state comes from the episodes below).
-    sh_new = PlexShow(rating_key="sh_new", library_id=show_lib.id, title="New Show", year=2005,
-                      added_at=_dt(5), child_count=1, genres=["Sci-Fi"], content_rating="TV-14")
-    sh_prog = PlexShow(rating_key="sh_prog", library_id=show_lib.id, title="Prog Show", year=2006,
-                       added_at=_dt(6), child_count=1, genres=["Sci-Fi", "Drama"], content_rating="TV-MA")
-    sh_watch = PlexShow(rating_key="sh_watch", library_id=show_lib.id, title="Watched Show", year=2007,
-                        added_at=_dt(7), child_count=1, genres=["Drama"], content_rating="TV-PG")
+    sh_new = PlexShow(
+        rating_key="sh_new",
+        library_id=show_lib.id,
+        title="New Show",
+        year=2005,
+        added_at=_dt(5),
+        child_count=1,
+        genres=["Sci-Fi"],
+        content_rating="TV-14",
+    )
+    sh_prog = PlexShow(
+        rating_key="sh_prog",
+        library_id=show_lib.id,
+        title="Prog Show",
+        year=2006,
+        added_at=_dt(6),
+        child_count=1,
+        genres=["Sci-Fi", "Drama"],
+        content_rating="TV-MA",
+    )
+    sh_watch = PlexShow(
+        rating_key="sh_watch",
+        library_id=show_lib.id,
+        title="Watched Show",
+        year=2007,
+        added_at=_dt(7),
+        child_count=1,
+        genres=["Drama"],
+        content_rating="TV-PG",
+    )
     db.add_all([m_new, m_prog, m_watch, m_hidden, sh_new, sh_prog, sh_watch])
     db.flush()
 
@@ -64,8 +121,17 @@ def _seed(db):
         se = PlexSeason(rating_key=f"se_{rk}", show_id=show.id, season_number=1)
         db.add(se)
         db.flush()
-        ep = PlexItem(rating_key=rk, library_id=show_lib.id, kind="episode", title=f"Ep {rk}",
-                      show_id=show.id, season_id=se.id, season_number=1, episode_number=n, added_at=_dt(day))
+        ep = PlexItem(
+            rating_key=rk,
+            library_id=show_lib.id,
+            kind="episode",
+            title=f"Ep {rk}",
+            show_id=show.id,
+            season_id=se.id,
+            season_number=1,
+            episode_number=n,
+            added_at=_dt(day),
+        )
         db.add(ep)
         db.flush()
         return ep
@@ -78,13 +144,15 @@ def _seed(db):
     user = User(email="plexparity@example.com")
     db.add(user)
     db.flush()
-    db.add_all([
-        PlexState(user_id=user.id, item_id=m_prog.id, position_seconds=120),
-        PlexState(user_id=user.id, item_id=m_watch.id, status="watched"),
-        PlexState(user_id=user.id, item_id=m_hidden.id, status="hidden"),
-        PlexState(user_id=user.id, item_id=e_prog.id, position_seconds=90),
-        PlexState(user_id=user.id, item_id=e_watch.id, status="watched"),
-    ])
+    db.add_all(
+        [
+            PlexState(user_id=user.id, item_id=m_prog.id, position_seconds=120),
+            PlexState(user_id=user.id, item_id=m_watch.id, status="watched"),
+            PlexState(user_id=user.id, item_id=m_hidden.id, status="hidden"),
+            PlexState(user_id=user.id, item_id=e_prog.id, position_seconds=90),
+            PlexState(user_id=user.id, item_id=e_watch.id, status="watched"),
+        ]
+    )
     db.commit()
     # rating_key -> (table, genres, content_rating) so the test can total the grid's visible set.
     meta = {}