feat: implement TTS, Document processing, and Memory Service /facts API

- TTS: xtts-v2 integration with voice cloning support
- Document: docling integration for PDF/DOCX/PPTX processing
- Memory Service: added /facts/upsert, /facts/{key}, /facts endpoints
- Added required dependencies (TTS, docling)

services/chandra-inference/Dockerfile

@@ -0,0 +1,37 @@
+FROM nvidia/cuda:12.1.0-runtime-ubuntu22.04
+
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    python3.11 \
+    python3-pip \
+    curl \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Python dependencies
+RUN pip3 install --no-cache-dir \
+    torch \
+    torchvision \
+    transformers \
+    accelerate \
+    pillow \
+    fastapi \
+    uvicorn \
+    python-multipart \
+    pydantic \
+    httpx \
+    tiktoken \
+    sentencepiece \
+    einops \
+    verovio
+
+# Copy inference service
+COPY . /app
+
+# Expose port
+EXPOSE 8000
+
+# Run inference service
+CMD ["python3", "main.py"]