add tester ui, and restructure folders

ctrl/k8s/base/Caddyfile

@@ -4,6 +4,22 @@
 }
 
 eth.local.ar:80 {
+    # API surface for the local Lambda tester (FastAPI in the lambda pod).
+    # Path-based is fine for our own API — no SPA assumes ownership of `/`,
+    # and a single origin means no CORS headaches with the frontend at /.
+    handle_path /runner/* {
+        reverse_proxy lambda:8000
+    }
+
+    # Everything else → static docs viewer (the frontend lives here too).
+    handle {
+        reverse_proxy docs:80
+    }
+}
+
+docs.eth.local.ar:80 {
+    # Serve /docs.html for the root path; everything else (graphs, viewer.html) passes through.
+    rewrite / /docs.html
     reverse_proxy docs:80
 }