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/alembic/versions/0056_plex_people.py

@@ -4,6 +4,7 @@ Revision ID: 0056_plex_people
 Revises: 0055_channel_keywords
 Create Date: 2026-07-19
 """
+
 from typing import Sequence, Union
 
 from alembic import op
@@ -23,8 +24,12 @@ def upgrade() -> None:
         # A representative proxied headshot URL (or NULL when none is available). Captured
         # opportunistically from an item's rich metadata (info-page view + the rich re-sync).
         sa.Column("photo_thumb", sa.Text(), nullable=True),
-        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
-        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
+        sa.Column(
+            "created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False
+        ),
+        sa.Column(
+            "updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False
+        ),
     )
     op.create_index("ix_plex_people_name", "plex_people", ["name"], unique=True)