perf(frontend): lazy-load modals + split heavy vendor chunks (#4501)

* perf(frontend): lazy-load modals on inbounds / clients / index pages

Modals on the three list pages were imported statically, so the JS +
CSS for every form, info, qr, log, backup, metrics, system-history,
version, and config-text modal sat in the initial bundle even though
they're only needed after a click.

Converted those imports to React.lazy() and gated each modal with a
new LazyMount helper that mounts on first open and keeps the component
mounted thereafter so AntD close animations still play.

Build now emits a dedicated chunk per modal — InboundFormModal at
66 kB (13 kB gzipped) and InboundInfoModal at 23 kB (4 kB gzipped)
are the largest, totalling roughly 150 kB of code that no longer
parses on first paint. Profiler measured the inbounds-page React
render tree drop from ~444 ms to ~254 ms on a prod build.

* perf(frontend): split codemirror / jalali / otpauth into lazy vendor chunks

Heavy libs (codemirror, persian-calendar-suite, otpauth) and antd's
rc-/cssinjs transitive deps used to fall into the catch-all `vendor`
chunk and load with every entry point. Give them their own manualChunks
groups so they only load with the lazy modal/page that needs them.

Initial vendor (catch-all) drops from 1293 kB / 408 kB gzip to
76 kB / 27 kB gzip; codemirror (408 kB / 131 kB gzip) is now on the
JsonEditor lazy path instead of the inbounds/clients/index initial load.

frontend/src/pages/clients/ClientsPage.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useMemo, useState } from 'react';
+import { lazy, useCallback, useEffect, useMemo, useState } from 'react';
 import { useTranslation } from 'react-i18next';
 import {
   Badge,
@@ -51,11 +51,12 @@ import AppSidebar from '@/components/AppSidebar';
 import CustomStatistic from '@/components/CustomStatistic';
 import { IntlUtil, SizeFormatter } from '@/utils';
 import { setMessageInstance } from '@/utils/messageBus';
-import ClientFormModal from './ClientFormModal';
-import ClientInfoModal from './ClientInfoModal';
-import ClientQrModal from './ClientQrModal';
-import ClientBulkAddModal from './ClientBulkAddModal';
-import ClientBulkAdjustModal from './ClientBulkAdjustModal';
+import LazyMount from '@/components/LazyMount';
+const ClientFormModal = lazy(() => import('./ClientFormModal'));
+const ClientInfoModal = lazy(() => import('./ClientInfoModal'));
+const ClientQrModal = lazy(() => import('./ClientQrModal'));
+const ClientBulkAddModal = lazy(() => import('./ClientBulkAddModal'));
+const ClientBulkAdjustModal = lazy(() => import('./ClientBulkAdjustModal'));
 import '@/styles/page-cards.css';
 import './ClientsPage.css';
 
@@ -853,51 +854,61 @@ export default function ClientsPage() {
           </Layout.Content>
         </Layout>
 
-        <ClientFormModal
-          open={formOpen}
-          mode={formMode}
-          client={editingClient}
-          attachedIds={editingAttachedIds}
-          inbounds={inbounds}
-          ipLimitEnable={ipLimitEnable}
-          tgBotEnable={tgBotEnable}
-          save={onSave}
-          onOpenChange={setFormOpen}
-        />
-        <ClientInfoModal
-          open={infoOpen}
-          client={infoClient}
-          inboundsById={inboundsById}
-          isOnline={infoClient ? isOnline(infoClient.email) : false}
-          subSettings={subSettings}
-          onOpenChange={setInfoOpen}
-        />
-        <ClientQrModal
-          open={qrOpen}
-          client={qrClient}
-          subSettings={subSettings}
-          onOpenChange={setQrOpen}
-        />
-        <ClientBulkAddModal
-          open={bulkAddOpen}
-          inbounds={inbounds}
-          ipLimitEnable={ipLimitEnable}
-          onOpenChange={setBulkAddOpen}
-          onSaved={() => setBulkAddOpen(false)}
-        />
-        <ClientBulkAdjustModal
-          open={bulkAdjustOpen}
-          count={selectedRowKeys.length}
-          onOpenChange={setBulkAdjustOpen}
-          onSubmit={async (addDays, addBytes) => {
-            const msg = await bulkAdjust([...selectedRowKeys], addDays, addBytes);
-            if (msg?.success) {
-              setSelectedRowKeys([]);
-              return msg.obj ?? { adjusted: 0 };
-            }
-            return null;
-          }}
-        />
+        <LazyMount when={formOpen}>
+          <ClientFormModal
+            open={formOpen}
+            mode={formMode}
+            client={editingClient}
+            attachedIds={editingAttachedIds}
+            inbounds={inbounds}
+            ipLimitEnable={ipLimitEnable}
+            tgBotEnable={tgBotEnable}
+            save={onSave}
+            onOpenChange={setFormOpen}
+          />
+        </LazyMount>
+        <LazyMount when={infoOpen}>
+          <ClientInfoModal
+            open={infoOpen}
+            client={infoClient}
+            inboundsById={inboundsById}
+            isOnline={infoClient ? isOnline(infoClient.email) : false}
+            subSettings={subSettings}
+            onOpenChange={setInfoOpen}
+          />
+        </LazyMount>
+        <LazyMount when={qrOpen}>
+          <ClientQrModal
+            open={qrOpen}
+            client={qrClient}
+            subSettings={subSettings}
+            onOpenChange={setQrOpen}
+          />
+        </LazyMount>
+        <LazyMount when={bulkAddOpen}>
+          <ClientBulkAddModal
+            open={bulkAddOpen}
+            inbounds={inbounds}
+            ipLimitEnable={ipLimitEnable}
+            onOpenChange={setBulkAddOpen}
+            onSaved={() => setBulkAddOpen(false)}
+          />
+        </LazyMount>
+        <LazyMount when={bulkAdjustOpen}>
+          <ClientBulkAdjustModal
+            open={bulkAdjustOpen}
+            count={selectedRowKeys.length}
+            onOpenChange={setBulkAdjustOpen}
+            onSubmit={async (addDays, addBytes) => {
+              const msg = await bulkAdjust([...selectedRowKeys], addDays, addBytes);
+              if (msg?.success) {
+                setSelectedRowKeys([]);
+                return msg.obj ?? { adjusted: 0 };
+              }
+              return null;
+            }}
+          />
+        </LazyMount>
       </Layout>
     </ConfigProvider>
   );