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>

server.mjs

@@ -1123,6 +1123,7 @@ const server = createServer(async (req, res) => {
       uptimeHuman: `${Math.floor(uptimeMs / 3600000)}h ${Math.floor((uptimeMs % 3600000) / 60000)}m`,
       claudeBinary: CLAUDE,
       claudeBinaryOk: binaryOk,
+      authMode: AUTH_MODE,
       auth: authStatus,
       config: {
         timeout: TIMEOUT,