feat: integrate all 10 skills into homelab-topology

- Added api-security-hardening (helmet, rate limits)
- Added nodejs-backend-patterns (error handling)
- Added observability-monitoring (pino logging)
- Added websocket-engineer (socket.io real-time updates)
- Added docker (Multi-stage build, compose)
- Added vitest (testing configuration and store tests)
- Added data-visualizer (MetricsBar and HostChart)
- Added infrastructure-monitoring/proxmox-admin/network-engineer types
- Fixed UI accessibility and styling
- Cleaned up node_modules tracking

Dockerfile

@@ -0,0 +1,37 @@
+# Build stage
+FROM node:18-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+# Production stage
+FROM node:18-alpine
+WORKDIR /app
+
+# Non-root user for security
+RUN addgroup -S appgroup && adduser -S appuser -G appgroup
+
+COPY package*.json ./
+RUN npm ci --only=production
+
+# Copy built frontend
+COPY --from=builder /app/dist ./dist
+
+# Copy server files
+COPY server/ ./server/
+COPY tsconfig*.json ./
+
+ENV NODE_ENV=production
+ENV PORT=3001
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD wget --no-verbose --tries=1 --spider http://localhost:3001/api/health || exit 1
+
+USER appuser
+
+EXPOSE 3000 3001
+
+CMD ["npx", "tsx", "server/index.ts"]