Add VK booking-only policy and anti-bot protection

skills/vk-gateway/.env.example

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+# VK community settings
+VK_GROUP_ID=24068391
+VK_TOKEN=vk1.a.your_community_token
+VK_API_VERSION=5.199
+VK_WAIT=25
+
+# Local endpoint used by longpoll worker
+OPENCLAW_BRIDGE_URL=http://127.0.0.1:8787/vk/inbound
+OPENCLAW_BRIDGE_TIMEOUT_MS=45000
+
+# OpenClaw Responses API
+OPENCLAW_RESPONSES_URL=http://127.0.0.1:18789/v1/responses
+OPENCLAW_GATEWAY_TOKEN=replace_with_gateway_token
+OPENCLAW_AGENT_MODEL=openclaw:main
+OPENCLAW_TIMEOUT_MS=60000
+
+# Endpoint bind
+VK_ENDPOINT_HOST=127.0.0.1
+VK_ENDPOINT_PORT=8787
+VK_ENDPOINT_PATH=/vk/inbound
+
+# Optional
+VK_ALLOWED_EVENTS=message_new
+VK_SYNC_LONGPOLL_SETTINGS=1
+
+# Anti-bot guard (rate + spam patterns)
+VK_ANTIBOT_ENABLED=1
+VK_ANTIBOT_WINDOW_SEC=20
+VK_ANTIBOT_MAX_MSGS=4
+VK_ANTIBOT_BLOCK_SEC=300
+
+LOG_LEVEL=info