feat(ui): add tool-test-console and tester dashboards

- Add Auto-Tester Dashboard (tester.html) in gateway for batch testing tools

- Add standalone Tool Test Console (tool-test-console.html) in core

- Fix Tailwind CSS Preflight conflicts in console UI

- Update console payload schema resolution to support both gateway and pod modes

- Strip JSON-RPC metadata from tool payload output in console

- Add unified navigation headers across all static HTML pages

dap-gateway/src/main/resources/static/playground.html

@@ -112,6 +112,8 @@
                     <a href="/catalog.html" style="color:#a1a1aa;" class="hover:text-white transition-colors">Catalog</a>
                     <a href="/playground.html" style="color:#ffffff;" class="font-semibold">Playground</a>
                     <a href="/chat.html" style="color:#a1a1aa;" class="hover:text-white transition-colors">Chat</a>
+                    <a href="/tester.html" style="color:#a1a1aa;" class="hover:text-white transition-colors">Tester</a>
+                    <a href="/tool-test-console.html" style="color:#a1a1aa;" class="hover:text-white transition-colors">Console</a>
                 </nav>
             </div>
             <div class="flex items-center space-x-3">