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/i18n/context.tsx

@@ -0,0 +1,78 @@
+import { createContext, useCallback, useContext, useEffect, useMemo, useState, type ReactNode } from "react";
+import en from "./en";
+import zh from "./zh";
+
+export type Locale = "zh" | "en";
+
+const STORAGE_KEY = "netx-locale";
+
+const MESSAGES: Record<Locale, typeof zh> = { zh, en };
+
+function resolveMessage(obj: unknown, path: string): string {
+  const keys = path.split(".");
+  let cur: unknown = obj;
+  for (const k of keys) {
+    if (cur == null || typeof cur !== "object") return path;
+    cur = (cur as Record<string, unknown>)[k];
+  }
+  return typeof cur === "string" ? cur : path;
+}
+
+function interpolate(text: string, vars?: Record<string, string | number>): string {
+  if (!vars) return text;
+  let out = text;
+  for (const [k, v] of Object.entries(vars)) {
+    out = out.replace(new RegExp(`\\{\\{${k}\\}\\}`, "g"), String(v));
+  }
+  return out;
+}
+
+type I18nContextValue = {
+  locale: Locale;
+  setLocale: (locale: Locale) => void;
+  t: (key: string, vars?: Record<string, string | number>) => string;
+};
+
+const I18nContext = createContext<I18nContextValue | null>(null);
+
+export function I18nProvider({ children }: { children: ReactNode }) {
+  const [locale, setLocaleState] = useState<Locale>(() => {
+    try {
+      const saved = localStorage.getItem(STORAGE_KEY);
+      return saved === "en" ? "en" : "zh";
+    } catch {
+      return "zh";
+    }
+  });
+
+  const setLocale = useCallback((next: Locale) => {
+    setLocaleState(next);
+    try {
+      localStorage.setItem(STORAGE_KEY, next);
+    } catch {
+      /* ignore */
+    }
+  }, []);
+
+  const t = useCallback(
+    (key: string, vars?: Record<string, string | number>) => {
+      const raw = resolveMessage(MESSAGES[locale], key);
+      return interpolate(raw, vars);
+    },
+    [locale],
+  );
+
+  useEffect(() => {
+    document.documentElement.lang = locale === "en" ? "en" : "zh-CN";
+  }, [locale]);
+
+  const value = useMemo(() => ({ locale, setLocale, t }), [locale, setLocale, t]);
+
+  return <I18nContext.Provider value={value}>{children}</I18nContext.Provider>;
+}
+
+export function useI18n() {
+  const ctx = useContext(I18nContext);
+  if (!ctx) throw new Error("useI18n must be used within I18nProvider");
+  return ctx;
+}