feat(connect): dedicated Claude.ai / ChatGPT browser connect picker

- Replace single 'Connect to Claude / ChatGPT' button with a modal picker
  offering Claude.ai web, Claude Desktop, Codex CLI, and ChatGPT/GPT Actions.
- Add /oauth/connect-claude-ai backend route that redirects to Anthropic's
  official https://claude.ai/api/mcp/auth_callback OAuth callback.
- Update MCP callback result page with browser-specific instructions for
  Claude.ai web, Claude Desktop, ChatGPT/GPT Actions, and Codex CLI.
- Deploy new app and hermes images to K8s.

product/app/app-k8s.yaml

@@ -15,7 +15,7 @@ spec:
     spec:
       containers:
         - name: squaremcp-app
-          image: localhost:32000/squaremcp-app@sha256:88c9163b49a881b2d8e59f46d66297902109026d138e9562b9fcc1bb0f4ab4d6
+          image: localhost:32000/squaremcp-app@sha256:9c2601dd74bfca9f22350a38dc616eb8a76580090587803911bb2e5633ace361
           imagePullPolicy: Always
           ports:
             - containerPort: 8080