feat: Refactor LLM router and integrate health check endpoint

- Simplified LLM call logic in llm_router.py, removing tool adapter complexity and enhancing error handling.
- Added health check endpoint to main.py for system status verification.
- Cleaned up router.py by removing unused imports and commented-out code, streamlining the structure.
- Updated docker-compose.yml to unify services under a single Lyra container, enhancing deployment simplicity.
- Created Dockerfile for unified container setup, including both Relay and Cortex services.
- Added QUICKSTART.md for improved onboarding and usage instructions.
- Implemented start.sh script to manage service startup and health checks.

Dockerfile

@@ -0,0 +1,48 @@
+# Unified Lyra Container - Relay (Node) + Cortex (Python)
+FROM python:3.11-slim
+
+# Install Node.js, npm, and docker CLI
+RUN apt-get update && apt-get install -y \
+    curl \
+    docker.io \
+    && curl -fsSL https://deb.nodesource.com/setup_18.x | bash - \
+    && apt-get install -y nodejs \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# ============================================================
+# Install Python dependencies (Cortex)
+# ============================================================
+COPY cortex/requirements.txt /app/cortex/requirements.txt
+RUN pip install --no-cache-dir -r /app/cortex/requirements.txt
+
+# ============================================================
+# Install Node dependencies (Relay)
+# ============================================================
+COPY core/relay/package*.json /app/relay/
+WORKDIR /app/relay
+RUN npm install
+
+# ============================================================
+# Copy application code
+# ============================================================
+WORKDIR /app
+COPY cortex/ /app/cortex/
+COPY core/relay/ /app/relay/
+
+# ============================================================
+# Copy startup script
+# ============================================================
+COPY start.sh /app/start.sh
+RUN chmod +x /app/start.sh
+
+# ============================================================
+# Expose ports
+# ============================================================
+EXPOSE 7078 7081
+
+# ============================================================
+# Start both services
+# ============================================================
+CMD ["/app/start.sh"]