[Refactor] Add Ming Flash Omni TTS adapter (#5746)

Signed-off-by: boatman <109857087+sphinxkkkbc@users.noreply.github.com>

tests/entrypoints/openai_api/test_tts_adapter.py

@@ -63,12 +63,6 @@ def test_resolve_unknown_returns_none():
     assert resolve_adapter(None) is None
 
 
-def test_ming_flash_omni_not_migrated():
-    """ming_flash_omni is intentionally excluded from the adapter migration in
-    this PR; it stays on the legacy inline dispatch in serving_speech.py."""
-    assert resolve_adapter("ming_flash_omni_tts") is None
-
-
 def test_voxcpm2_resolves():
     """VoxCPM2 (the served ``latent_generator`` model) resolves cleanly.