fix: remove patch step from Dockerfile (build context is just ai/)

ai/Dockerfile

@@ -52,11 +52,7 @@ url = 'https://huggingface.co/rhasspy/piper-voices/resolve/main/en/en_US/norman/
 urllib.request.urlretrieve(url, base + '/en_US-norman-medium.onnx')
 urllib.request.urlretrieve(url + '.json', base + '/en_US-norman-medium.onnx.json')
 PYEOF
-
-# ---------- Patch tts_tool.py: replace Edge TTS fallback with Piper ----------
-COPY patch_tts_tool.py /tmp/patch_tts_tool.py
-RUN /opt/hermes/.venv/bin/python3 /tmp/patch_tts_tool.py && rm /tmp/patch_tts_tool.py
-
+ 
 # ---------- Runtime ----------
 ENV HERMES_HOME=/opt/data
 ENV PATH="/opt/data/.local/bin:${PATH}"