Final cleanup: Merge LLM, add Dockerfile

- Merge llm.py + llm_sync.py into single unified client
- Remove llm_sync.py (now just llm.py with both sync/async)
- Add requests to dependencies
- Add Dockerfile for containerized deployment
- Add .dockerignore

All issues resolved!

Dockerfile

@@ -0,0 +1,51 @@
+# =============================================================================
+# Opus Orchestrator AI - Dockerfile
+# =============================================================================
+# Build: docker build -t opus-orchestrator .
+# Run:   docker run -p 8080:8080 -p 8000:8000 -e OPENAI_API_KEY=sk-... opus-orchestrator
+# =============================================================================
+
+FROM python:3.12-slim
+
+# Labels
+LABEL maintainer="mark@thefoldwithin.earth"
+LABEL description="AI-powered book generation system"
+LABEL version="0.2.0"
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy project files
+COPY pyproject.toml README.md install.sh ./
+COPY opus_orchestrator/ ./opus_orchestrator/
+COPY config.example.yaml ./
+
+# Create virtual environment
+RUN python -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -e ".[all]"
+
+# Create non-root user
+RUN useradd -m -u 1000 opus && \
+    chown -R opus:opus /app
+
+# Switch to non-root user
+USER opus
+
+# Expose ports
+EXPOSE 8000 8080
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:8000/health || exit 1
+
+# Default command: start web UI
+CMD ["python", "-m", "opus_orchestrator", "ui", "--port", "8080"]