Add memory-viewer from silicondawn

- Web UI for browsing and editing OpenClaw memory files
- Cloned from https://github.com/silicondawn/memory-viewer
- Built and running on port 8901
- Features: file tree, markdown rendering, search, live reload
- Full access to MEMORY.md, daily notes, skills, automations

memory-viewer/Dockerfile

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+# Multi-stage build for production
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files first for better layer caching
+COPY package*.json ./
+RUN npm ci
+
+# Copy source code
+COPY . .
+
+# Build frontend
+RUN npm run build
+
+# Fix ServerWebSocket type issue by replacing with any type
+RUN sed -i 's/import type { ServerWebSocket } from "@hono\/node-ws";/type ServerWebSocket = any;/' server/index.ts
+
+# Compile TypeScript server to JavaScript
+RUN npx tsc --project tsconfig.server.json
+
+# Production stage
+FROM node:20-alpine AS production
+
+WORKDIR /app
+
+# Create non-root user for security
+RUN addgroup -g 1001 -S nodejs && \
+    adduser -S nodejs -u 1001
+
+# Copy package files and install production dependencies only
+COPY package*.json ./
+RUN npm ci --omit=dev && npm cache clean --force
+
+# Copy built frontend assets
+COPY --from=builder /app/dist ./dist
+
+# Copy compiled server JavaScript
+COPY --from=builder /app/server-dist ./server-dist
+
+# Create workspace directory for memory files
+RUN mkdir -p /app/workspace && chown -R nodejs:nodejs /app
+
+# Switch to non-root user
+USER nodejs
+
+# Expose the default port
+EXPOSE 8901
+
+# Set production environment
+ENV NODE_ENV=production
+ENV PORT=8901
+ENV WORKSPACE_DIR=/app/workspace
+ENV STATIC_DIR=/app/dist
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
+  CMD node -e "require('http').get('http://localhost:8901/api/info', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})" || exit 1
+
+# Start the server using compiled JavaScript
+CMD ["node", "server-dist/index.js"]