feat(openclaw): deploy OpenClaw AI chatbot gateway on VM 120

- Add Docker Compose configs with security hardening (cap_drop ALL, non-root, read-only FS)
- Add Prometheus node_exporter scrape target for 192.168.2.120:9100
- Update services/README.md, INDEX.md, and CLAUDE_STATUS.md with VM 120
- Image pinned to v2026.2.1 (patches CVE-2026-25253)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

services/openclaw/.env.example

@@ -0,0 +1,35 @@
+# OpenClaw Configuration
+# Copy to .env and fill in values: cp .env.example .env
+# IMPORTANT: Never commit .env to git
+
+# =============================================================================
+# OpenClaw Version (must be >= 2026.2.1 due to CVE-2026-25253)
+# =============================================================================
+OPENCLAW_VERSION=2026.2.1
+
+# =============================================================================
+# Gateway Authentication
+# Generate with: openssl rand -hex 32
+# =============================================================================
+GATEWAY_TOKEN=
+
+# =============================================================================
+# LLM Provider API Keys (configure at least one)
+# =============================================================================
+ANTHROPIC_API_KEY=
+OPENAI_API_KEY=
+OLLAMA_BASE_URL=http://192.168.1.81:11434
+
+# =============================================================================
+# Messaging Platform Tokens (configure as needed)
+# =============================================================================
+DISCORD_TOKEN=
+TELEGRAM_TOKEN=
+SLACK_TOKEN=
+WHATSAPP_TOKEN=
+
+# =============================================================================
+# Application Settings
+# =============================================================================
+LOG_LEVEL=info
+DM_POLICY=pairing