feat: Enhance speaker analysis with gender inference and update related tests

tests/test_speaker_analysis.py

@@ -0,0 +1,44 @@
+from abogen.speaker_analysis import analyze_speakers
+
+
+def _chapters():
+    return [
+        {
+            "id": "0001",
+            "index": 0,
+            "title": "Test",
+            "text": "",
+            "enabled": True,
+        }
+    ]
+
+
+def _chunk(text: str, idx: int) -> dict:
+    return {
+        "id": f"chunk-{idx}",
+        "chapter_index": 0,
+        "chunk_index": idx,
+        "text": text,
+    }
+
+
+def test_analyze_speakers_infers_gender_from_pronouns():
+    chunks = [
+        _chunk("\"Greetings,\" said John. He adjusted his hat as he smiled.", 0),
+        _chunk("\"Hello,\" said Mary. She straightened her dress as she introduced herself.", 1),
+        _chunk("\"Nice to meet you,\" said Alex.", 2),
+    ]
+
+    analysis = analyze_speakers(_chapters(), chunks, threshold=1, max_speakers=0)
+
+    john = analysis.speakers.get("john")
+    mary = analysis.speakers.get("mary")
+    alex = analysis.speakers.get("alex")
+
+    assert john is not None
+    assert mary is not None
+    assert alex is not None
+
+    assert john.gender == "male"
+    assert mary.gender == "female"
+    assert alex.gender == "unknown"