feat(web): NetX workbench, UME-only UI, i18n, and header status

- Replace sidebar app with workbench home and module tabs (openOrFocusModule)

- Remove legacy pages; add module registry, shared tab channel, WEB.md

- Add zh/en i18n, global ToastProvider, restore oclaw bridge pill in header

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/components/HeaderMenu.tsx

@@ -0,0 +1,67 @@
+import { useEffect, useRef, useState } from "react";
+import { useI18n, type Locale } from "../i18n";
+
+export function HeaderMenu() {
+  const { t, locale, setLocale } = useI18n();
+  const [open, setOpen] = useState(false);
+  const rootRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    if (!open) return;
+    const onDocClick = (ev: MouseEvent) => {
+      if (!rootRef.current?.contains(ev.target as Node)) setOpen(false);
+    };
+    const onKey = (ev: KeyboardEvent) => {
+      if (ev.key === "Escape") setOpen(false);
+    };
+    document.addEventListener("mousedown", onDocClick);
+    document.addEventListener("keydown", onKey);
+    return () => {
+      document.removeEventListener("mousedown", onDocClick);
+      document.removeEventListener("keydown", onKey);
+    };
+  }, [open]);
+
+  const pick = (next: Locale) => {
+    setLocale(next);
+    setOpen(false);
+  };
+
+  return (
+    <div className="header-menu header-menu--on-brand" ref={rootRef}>
+      <button
+        type="button"
+        className="header-menu__trigger header-menu__trigger--on-brand"
+        aria-label={t("layout.moreMenu")}
+        aria-haspopup="menu"
+        aria-expanded={open}
+        onClick={() => setOpen((v) => !v)}
+      >
+        ⋯
+      </button>
+      {open ? (
+        <div className="header-menu__panel header-menu__panel--light" role="menu">
+          <div className="header-menu__label header-menu__label--light">{t("layout.language")}</div>
+          <button
+            type="button"
+            role="menuitemradio"
+            className={`header-menu__item header-menu__item--light${locale === "zh" ? " header-menu__item--active-light" : ""}`}
+            aria-checked={locale === "zh"}
+            onClick={() => pick("zh")}
+          >
+            {t("layout.langZh")}
+          </button>
+          <button
+            type="button"
+            role="menuitemradio"
+            className={`header-menu__item header-menu__item--light${locale === "en" ? " header-menu__item--active-light" : ""}`}
+            aria-checked={locale === "en"}
+            onClick={() => pick("en")}
+          >
+            {t("layout.langEn")}
+          </button>
+        </div>
+      ) : null}
+    </div>
+  );
+}