feat: add auto-start on boot and restructure README (v1.5.0)

- setup.mjs: install launchd plist (macOS) or systemd user service (Linux) after proxy starts; logs to ~/.openclaw/logs/proxy.log
- Add uninstall.mjs to stop and remove the auto-start entry
- README: Quick Start (Node.js) first, Security section, Docker moved to Server/Advanced
- Bump version to 1.5.0

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "openclaw-claude-proxy",
-  "version": "1.4.0",
+  "version": "1.5.0",
   "description": "OpenAI-compatible proxy that routes requests through Claude CLI — use your Claude Pro/Max subscription as an OpenClaw model provider",
   "type": "module",
   "bin": {