Add OpenClaw service integration

[Copilot]

OpenClaw was referenced in config, workflow, and docs but had no TypeScript config schema support or environment variable wiring.

Changes

• src/config/index.ts — Added optional openClaw Zod schema block (enabled, apiKey, baseUrl) matching the ai/vectorDb pattern; wired OPENCLAW_ENABLED, OPENCLAW_API_KEY, and SERVICE_BASE_URL_OPENCLAW in loadConfig()
• .env.example — Added commented-out OpenClaw env var examples

openClaw: z.object({
  enabled: z.coerce.boolean().default(false),
  apiKey: z.string().optional(),
  baseUrl: z.string().url().optional(),
}).optional(),

config/services.example.json, integrations.yml, and README.md already covered OpenClaw — no changes needed there.

Original prompt

Add OpenClaw

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