feat: Add handling for author-series name collisions in Audiobookshelf metadata

tests/test_service.py

@@ -248,4 +248,36 @@ def test_audiobookshelf_metadata_allows_decimal_sequence(tmp_path):
 
     metadata = _build_audiobookshelf_metadata(job)
 
-    assert metadata["seriesSequence"] == "4.5"
+    assert metadata["seriesSequence"] == "4.5"
+
+
+def test_audiobookshelf_metadata_ignores_author_series_collision(tmp_path):
+    source = tmp_path / "book.txt"
+    source.write_text("content", encoding="utf-8")
+
+    job = Job(
+        id="job-abs-author-series",
+        original_filename="book.txt",
+        stored_path=source,
+        language="en",
+        voice="af_alloy",
+        speed=1.0,
+        use_gpu=False,
+        subtitle_mode="Sentence",
+        output_format="mp3",
+        save_mode="Save next to input file",
+        output_folder=tmp_path,
+        replace_single_newlines=False,
+        subtitle_format="srt",
+        created_at=time.time(),
+        metadata_tags={
+            "series": "Jane Doe",
+            "series_index": "1",
+            "authors": "Jane Doe",
+        },
+    )
+
+    metadata = _build_audiobookshelf_metadata(job)
+
+    assert "seriesName" not in metadata
+    assert "seriesSequence" not in metadata