openai: add AI stack (litellm + langfuse + pipecat + silero-tts) and oO aliases

- LiteLLM proxy with langfuse callbacks, postgres backends, and OpenRouter fallbacks.
- Langfuse observability UI.
- Pipecat voice pipeline (LiveKit + STT + TTS + LLM) and Silero TTS build contexts.
- Ollama tuned for GPU (OLLAMA_NUM_GPU=999, mem_limit=4g, max 2 loaded models).
- open-webui wired to litellm + faster-whisper + silero for voice.
- litellm-config.yaml publishes oO's model aliases (tip-generator, embedder, judge)
  pointing at the host ollama on :11434 so ml/serving can call them via LiteLLM.

.env skipped (secrets).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

openai/pipecat/Dockerfile

@@ -0,0 +1,18 @@
+FROM python:3.11-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends gcc g++ && rm -rf /var/lib/apt/lists/*
+
+# CPU torch first — prevents silero-vad from pulling in the CUDA variant
+RUN pip install --no-cache-dir torch --index-url https://download.pytorch.org/whl/cpu
+
+RUN pip install --no-cache-dir \
+    "pipecat-ai[openai,livekit,silero]" \
+    "livekit-api" \
+    fastapi \
+    "uvicorn[standard]"
+
+WORKDIR /app
+COPY . .
+
+EXPOSE 8882
+CMD ["uvicorn", "bot:app", "--host", "0.0.0.0", "--port", "8882"]