feat: add ocp update command + fix restart for new service names

- `ocp update`: pulls latest from GitHub, syncs plugin, restarts proxy
- `ocp update --check`: shows current vs latest version without applying
- `ocp restart`: now handles both dev.ocp.proxy and legacy ai.openclaw.proxy
  service names on macOS/Linux
- Bumps to v3.2.0

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ocp-plugin/openclaw.plugin.json

@@ -2,7 +2,7 @@
   "id": "ocp",
   "name": "OCP Commands",
   "description": "Slash commands for the OpenClaw Proxy — /ocp usage, /ocp settings, /ocp health, etc.",
-  "version": "3.1.0",
+  "version": "3.2.0",
   "configSchema": {
     "type": "object",
     "additionalProperties": false,

ocp-plugin/package.json

@@ -1,6 +1,6 @@
 {
   "name": "ocp",
-  "version": "3.1.0",
+  "version": "3.2.0",
   "description": "Slash commands for the OpenClaw Proxy",
   "main": "index.js",
   "type": "module",