Extract memind_adm admin server, add local dev tooling, and remove image-generation.

Split platform admin and ops APIs into standalone admin-server.mjs with network guards; simplify billing to RMB token pricing, refactor user auth, and add rsync deploy plus local-test scripts and docs.

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

ops/src/lib/auth.tsx

@@ -0,0 +1,30 @@
+import { createContext, useContext, useEffect, useState } from 'react';
+
+export type AuthUser = {
+  id: string;
+  username: string;
+  displayName: string;
+  role: string;
+  status?: string;
+};
+
+type AuthState = { loading: boolean; user: AuthUser | null };
+
+const AuthContext = createContext<AuthState>({ loading: true, user: null });
+
+export function AuthProvider({ children }: { children: React.ReactNode }) {
+  const [state, setState] = useState<AuthState>({ loading: true, user: null });
+
+  useEffect(() => {
+    void fetch('/auth/status', { credentials: 'include' })
+      .then((r) => r.json())
+      .then((auth: { authenticated: boolean; user?: AuthUser }) => {
+        setState({ loading: false, user: auth.authenticated ? (auth.user ?? null) : null });
+      })
+      .catch(() => setState({ loading: false, user: null }));
+  }, []);
+
+  return <AuthContext.Provider value={state}>{children}</AuthContext.Provider>;
+}
+
+export const useAuth = () => useContext(AuthContext);