feat: add ocp-connect lightweight client + restructure README

- Add standalone `ocp-connect` script for zero-dependency client setup
  (only needs curl + python3, no Node/repo clone required)
- Add `ocp connect` command to main CLI
- Add `authMode` field to /health endpoint
- Restructure README with clear Server Setup / Client Setup sections
- Add dashboard screenshot to README
- Fix smoke test model name (claude-haiku-4-5-20251001)
- Fix auth mode detection for shared/multi/none
- Fix rc file cleanup idempotency (blank line handling)
- Fix key input echo (now hidden with read -rs)
- Add host validation
- Bump version to 3.5.0

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "openclaw-claude-proxy",
-  "version": "3.4.0",
+  "version": "3.5.0",
   "description": "OCP (Open Claude Proxy) — use your Claude Pro/Max subscription as an OpenAI-compatible API for any IDE. Works with Cline, OpenCode, Aider, Continue.dev, OpenClaw, and more.",
   "type": "module",
   "bin": {