Add basic web app and API integration

web/config.js

@@ -0,0 +1,24 @@
+const API_BASE = "http://127.0.0.1:8080";
+
+function getApiBase() {
+  return API_BASE;
+}
+
+function apiURL(path) {
+  const base = getApiBase();
+  if (!base) return path;
+  return base + path;
+}
+
+function wsURL(path) {
+  const base = getApiBase();
+  if (base) {
+    let u;
+    try { u = new URL(base); } catch (e) { return null; }
+    u.protocol = u.protocol === "https:" ? "wss:" : "ws:";
+    u.pathname = u.pathname.replace(/\/+$/, "") + path;
+    return u.toString();
+  }
+  const proto = location.protocol === "https:" ? "wss:" : "ws:";
+  return `${proto}//${location.host}${path}`;
+}