feat: skill expansion — browser, security, SQL, files (16 skills total)

Novas skills instaladas:
- openclaw-agent-browser   v1.0.0  CLI Chromium — navegação, login, screenshots, state
- skill-security-audit    v1.0.0  SAST scanning, prompt injection, secrets audit
- sql-toolkit             v1.0.0  PostgreSQL/MySQL/SQLite — schema, query, otimização
- file                    v1.0.0  Organização de arquivos por contexto
- file-summary            v1.0.0  Extração e resumo de PDFs, Word, Excel

Workspace expandido:
- TOOLS.md: +Browser automation, Security audit, SQL, File management
- AGENTS.md: +Linux Analyst section (comandos, logs, rede, scripts) + Full-stack strategy
- MEMORY.md: 16 skills indexadas, stack map, comandos Linux ref
- SESSION-STATE.md: atualizado com contexto completo
- lock.json: sincronizado com 16 skills instaladas

skills/xcloud-docker-deploy/dockerfiles/node-app.Dockerfile

@@ -0,0 +1,25 @@
+# Multi-stage Node.js Dockerfile (Express / Fastify / generic)
+# xCloud: pair with compose-templates/nodejs-api-postgres.yml
+
+FROM node:20-alpine AS deps
+WORKDIR /app
+COPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* ./
+RUN if [ -f package-lock.json ]; then npm ci --omit=dev; \
+    elif [ -f yarn.lock ]; then yarn --frozen-lockfile --production; \
+    else npm install --omit=dev; fi
+
+FROM node:20-alpine AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+RUN addgroup --system --gid 1001 nodejs && \
+    adduser --system --uid 1001 nodeuser && \
+    chown -R nodeuser:nodejs /app
+USER nodeuser
+
+EXPOSE 3000
+ENV PORT=3000
+CMD ["node", "server.js"]