fix(fc2a): satisfy ruff 0.15.13 lint — UP017, UP042, I001

Ruff lint surfaced 23 violations across three rules; all addressed:

UP017 (Use datetime.UTC alias):
  Replaced 13 sites of datetime.now(timezone.utc) with datetime.now(UTC),
  also adjusted from-imports accordingly. UTC is a Python 3.11+ alias for
  timezone.utc that ruff's pyupgrade rules prefer.

UP042 (StrEnum):
  Replaced `class TagKind(str, Enum)` and `class SkipReason(str, Enum)`
  with `class Foo(StrEnum)`. StrEnum was added in Python 3.11 stdlib and
  is the modern idiom. Behavior is equivalent for our usage (the .value
  attribute, str(member) semantics).

I001 (Import sorting):
  Added `known-first-party = ["backend"]` to ruff.toml's [lint.isort] so
  ruff groups `backend.*` imports correctly. Without it, ruff treated
  them as third-party and demanded a different grouping. The existing
  import order is stdlib → third-party → first-party → local relative,
  which ruff now accepts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_maintenance.py

@@ -2,7 +2,7 @@
 function runs synchronously inside the same DB transaction as the test.
 """
 
-from datetime import datetime, timedelta, timezone
+from datetime import UTC, datetime, timedelta
 
 import pytest
 
@@ -26,7 +26,7 @@ def _make_batch(session) -> int:
 
 def test_recover_interrupted_only_old(db_sync):
     batch_id = _make_batch(db_sync)
-    now = datetime.now(timezone.utc)
+    now = datetime.now(UTC)
 
     fresh = ImportTask(
         batch_id=batch_id, source_path="/import/a.jpg", task_type="media",
@@ -52,7 +52,7 @@ def test_recover_interrupted_only_old(db_sync):
 
 def test_cleanup_old_deletes_finished_old(db_sync):
     batch_id = _make_batch(db_sync)
-    now = datetime.now(timezone.utc)
+    now = datetime.now(UTC)
 
     old_complete = ImportTask(
         batch_id=batch_id, source_path="/import/a.jpg", task_type="media",