Merge verified Odysseus fixes

tests/test_tts_available_nonstring_provider.py

@@ -0,0 +1,17 @@
+from services.tts.tts_service import TTSService
+
+
+def test_available_tolerates_non_string_provider(tmp_path):
+    """A hand-edited/corrupt data/settings.json can store a non-string
+    tts_provider (e.g. null or a number). available reads it and calls
+    provider.startswith("endpoint:"), which raised AttributeError on a
+    non-str. It must instead fall through and report unavailable."""
+    service = TTSService(cache_dir=str(tmp_path))
+    service._load_settings = lambda: {
+        "tts_enabled": True,
+        "tts_provider": 123,
+        "tts_model": "tts-1",
+        "tts_voice": "alloy",
+        "tts_speed": "1",
+    }
+    assert service.available is False