fix(admin): drop cached environment data when switching context

A doctor who also owns a clinic runs two environments, and a subscription
belongs to an environment, not to the user. The panel treated it as the
user's: the subscription query was keyed ['subscription-my'] with no
context, and switching environments never touched the react-query cache. So
upgrading the clinic left the personal practice showing the clinic's plan
with its feature-gated menu items unlocked, and vice versa.

The query key now carries the active dbUuid, and the context switch clears
the whole cache — every cached response belongs to the environment it was
fetched in, not just this one.

The API was already correct: DualEnvironmentSubscriptionTest pins that
granting one environment leaves the other on free.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/admin/pages/SelectContextPage.test.tsx

@@ -0,0 +1,48 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import { QueryClientProvider } from '@tanstack/react-query';
+import { MemoryRouter } from 'react-router';
+import { makeClient } from '../test/utils';
+import { useAuthStore } from '../stores/authStore';
+import SelectContextPage from './SelectContextPage';
+
+vi.mock('react-router', async () => {
+  const actual = await vi.importActual<typeof import('react-router')>('react-router');
+  return { ...actual, useNavigate: () => vi.fn() };
+});
+
+const initial = useAuthStore.getInitialState();
+
+const CONTEXTS = [
+  { db_uuid: 'doc-1',    db_key: 'k1', type: 'doctor', role: 'doctor', name: 'مطب شخصی' },
+  { db_uuid: 'clinic-1', db_key: 'k2', type: 'clinic', role: 'clinic', name: 'کلینیک تست' },
+];
+
+beforeEach(() => {
+  localStorage.clear();
+  useAuthStore.setState(initial, true);
+  useAuthStore.setState({ availableContexts: CONTEXTS as any, switchContext: vi.fn() as any });
+});
+
+describe('SelectContextPage', () => {
+  /**
+   * هر پاسخِ cache شده متعلق به محیط قبلی است. اشتراک روی محیط می‌نشیند، پس بدون
+   * پاک کردن cache، مطب شخصی پلن کلینیک را نشان می‌داد و برعکس.
+   */
+  it('بعد از تعویض محیط، cache کوئری‌ها را پاک می‌کند', async () => {
+    const client = makeClient();
+    client.setQueryData(['subscription-my', 'doc-1'], { stale: true });
+
+    render(<SelectContextPage />, {
+      wrapper: ({ children }) => (
+        <QueryClientProvider client={client}>
+          <MemoryRouter>{children}</MemoryRouter>
+        </QueryClientProvider>
+      ),
+    });
+
+    fireEvent.click(screen.getByText('کلینیک تست'));
+
+    await waitFor(() => expect(client.getQueryData(['subscription-my', 'doc-1'])).toBeUndefined());
+  });
+});

assets/admin/pages/SelectContextPage.tsx

@@ -1,5 +1,6 @@
 import { useNavigate } from 'react-router';
 import { useState } from 'react';
+import { useQueryClient } from '@tanstack/react-query';
 import { useAuthStore, ContextItem } from '../stores/authStore';
 
 const ROLE_LABELS: Record<string, string> = {
@@ -18,11 +19,15 @@ const TYPE_ICONS: Record<string, string> = {
 export default function SelectContextPage() {
   const { availableContexts, switchContext } = useAuthStore();
   const navigate = useNavigate();
+  const qc = useQueryClient();
   const [loading, setLoading] = useState<string | null>(null);
 
   const handleSelect = async (ctx: ContextItem) => {
     setLoading(ctx.db_uuid);
     await switchContext(ctx.db_uuid);
+    // هر پاسخِ cache‌شده متعلق به محیط قبلی است — از اشتراک و پلن گرفته تا بیماران و
+    // نوبت‌ها. بدون پاک کردن، محیط تازه داده و دسترسی‌های محیط قبلی را نشان می‌دهد.
+    qc.clear();
     navigate('/admin/dashboard', { replace: true });
   };