feat: partner-campaign integration in admin UI

- Add partner badge to campaigns list
- Add partner selector dropdown in campaign edit
- Support ?partnerId= query param in campaign create (replaces separate page)
- Filter already-assigned campaigns in partner assign flow
- Show taken campaigns greyed out with partner name
- Delete AdminPartnerCampaignCreate (replaced by query param approach)
- Add partner translations (ru, en, zh, fa)

src/App.tsx

@@ -66,7 +66,6 @@ const AdminApplicationReview = lazy(() => import('./pages/AdminApplicationReview
 const AdminPartnerCommission = lazy(() => import('./pages/AdminPartnerCommission'));
 const AdminPartnerRevoke = lazy(() => import('./pages/AdminPartnerRevoke'));
 const AdminPartnerCampaignAssign = lazy(() => import('./pages/AdminPartnerCampaignAssign'));
-const AdminPartnerCampaignCreate = lazy(() => import('./pages/AdminPartnerCampaignCreate'));
 const AdminWithdrawals = lazy(() => import('./pages/AdminWithdrawals'));
 const AdminWithdrawalDetail = lazy(() => import('./pages/AdminWithdrawalDetail'));
 const AdminWithdrawalReject = lazy(() => import('./pages/AdminWithdrawalReject'));
@@ -642,16 +641,6 @@ function App() {
             </AdminRoute>
           }
         />
-        <Route
-          path="/admin/partners/:userId/campaigns/create"
-          element={
-            <AdminRoute>
-              <LazyPage>
-                <AdminPartnerCampaignCreate />
-              </LazyPage>
-            </AdminRoute>
-          }
-        />
         <Route
           path="/admin/partners/:userId"
           element={