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/CONTRIBUTING.md

@@ -0,0 +1,39 @@
+# Contributing to xCloud Docker Deploy Skill
+
+Thank you for your interest in contributing! This skill helps AI agents deploy projects to xCloud hosting.
+
+## Ways to Contribute
+
+### Add a New Stack
+1. Add detection rules to `DETECT.md`
+2. Add a reference guide to `references/xcloud-native-STACK.md` or `references/scenario-STACK.md`
+3. Add a Dockerfile template to `dockerfiles/STACK.Dockerfile` (if Docker path)
+4. Add a compose template to `compose-templates/STACK.yml` (if Docker path)
+5. Add an example to `examples/STACK-app.md`
+6. Update the routing table in `SKILL.md` Phase 0
+
+### Fix or Improve
+- Incorrect xCloud platform behavior → update `references/xcloud-constraints.md`
+- Broken Dockerfile → fix `dockerfiles/`
+- Better nginx config → update scenario references or compose templates
+
+### Add Examples
+Real-world deployment scenarios are welcome in `examples/`. Follow the existing format.
+
+## Format Standards
+
+- All files: Markdown (`.md`) or YAML/Dockerfile
+- No executables, no network calls, no binary files
+- Keep `SKILL.md` concise — detailed content goes in `references/`
+- Test Dockerfiles with `docker build` before submitting
+
+## Pull Request Process
+
+1. Fork the repo
+2. Create a branch: `feat/add-STACK-support` or `fix/ISSUE`
+3. Make changes, update `CHANGELOG.md`
+4. Open a PR against `main`
+
+## Code of Conduct
+
+Be respectful and constructive. This is a community tool.