style(analysis): consolidate test imports at top of file (PEP 8)

tests/unit/test_data_audit.py

@@ -4,7 +4,10 @@ from __future__ import annotations
 
 from datetime import UTC, datetime
 
-from cerbero_bite.analysis.data_audit import _expected_ticks  # noqa: PLC2701
+from cerbero_bite.analysis.data_audit import (  # noqa: PLC2701
+    _detect_gaps,
+    _expected_ticks,
+)
 
 
 def test_expected_ticks_basic() -> None:
@@ -45,9 +48,6 @@ def test_expected_ticks_exact_quarter_boundary_is_excluded() -> None:
     assert _expected_ticks(since, until) == 3
 
 
-from cerbero_bite.analysis.data_audit import _detect_gaps  # noqa: PLC2701
-
-
 def test_detect_gaps_returns_empty_when_no_gap() -> None:
     ts = [
         datetime(2026, 5, 12, 12, 0, tzinfo=UTC),