Fix: Use correct health check endpoints for LiteLLM and Letta

Root cause: Status API was using wrong health endpoints:
- LiteLLM /health requires API key auth (returns 401) -> changed to /health/readiness (no auth)
- Letta /api/health returns 404 -> changed to /v1/health/ (correct endpoint)

Dockerfile

@@ -0,0 +1,9 @@
+FROM node:20-alpine
+RUN apk add --no-cache curl
+WORKDIR /app
+COPY package.json ./
+RUN npm install --production
+COPY server.js ./
+EXPOSE 3100
+HEALTHCHECK --interval=30s --timeout=10s --retries=3 CMD curl -sf http://localhost:3100/health || exit 1
+CMD ["node", "server.js"]