feat(admin-tickets): deep-link to a specific ticket from notifications

Add an /admin/tickets/:ticketId route that pre-selects the ticket, and a
StartParamNavigator that maps a Telegram Mini App start param (admin_ticket_<id>,
delivered by a group-chat t.me/<bot>/<app>?startapp deep link) to that route.

This lets the bot's admin ticket notification buttons open the cabinet straight on
the ticket — web_app buttons for private chats, the startapp deep link for groups
where web_app is unavailable. Selection mirrors the URL param (cleared on the bare
/admin/tickets list). The static /admin/tickets/settings route still out-ranks the
new dynamic segment.

Pairs with bot feature BEDOLAGA-DEV/remnawave-bedolaga-telegram-bot#2988.

src/App.tsx

@@ -632,6 +632,19 @@ function App() {
             </PermissionRoute>
           }
         />
+        {/* Deep-link target for admin ticket notification buttons (bot issue #2988):
+            opens a specific ticket directly. Static "/settings" above out-ranks
+            this dynamic segment in react-router, so there is no conflict. */}
+        <Route
+          path="/admin/tickets/:ticketId"
+          element={
+            <PermissionRoute permission="tickets:read">
+              <LazyPage>
+                <AdminTickets />
+              </LazyPage>
+            </PermissionRoute>
+          }
+        />
         <Route
           path="/admin/settings"
           element={