feat: Yandex Metrika CID tracking, offline conversions UI, sticky pay button

- Pass yandex_cid to all auth endpoints (telegram, email, OIDC, OAuth)
- Add OfflineConvGoal interface and offline_conv_* fields to AnalyticsCounters
- Add storeYandexCid API method for server-side CID persistence
- Add analytics fields to LandingConfig (view/click goals, sticky_pay_button)
- Add yandex_cid/referrer/subid to PurchaseRequest
- Add offline conversions UI block in admin AnalyticsTab
- Add cacheYandexCid, syncYandexCid, fireAnalyticsEvent to analytics hook
- Create yandexCid.ts utility (localStorage get/set helpers)
- Add sticky pay button with portal on mobile in QuickPurchase
- Fire view/click analytics goals on landing pages
- Persist contact value and referrer/subid in session/localStorage
- Add i18n keys for offlineConv and apiKey in all 4 locales

src/api/auth.ts

@@ -1,4 +1,5 @@
 import apiClient from './client';
+import { getYandexCid } from '../utils/yandexCid';
 import type {
   AuthResponse,
   LinkCallbackResponse,
@@ -22,6 +23,7 @@ export const authApi = {
       init_data: initData,
       campaign_slug: campaignSlug || undefined,
       referral_code: referralCode || undefined,
+      yandex_cid: getYandexCid() || undefined,
     });
     return response.data;
   },
@@ -43,6 +45,7 @@ export const authApi = {
       ...data,
       campaign_slug: campaignSlug || undefined,
       referral_code: referralCode || undefined,
+      yandex_cid: getYandexCid() || undefined,
     });
     return response.data;
   },
@@ -56,6 +59,7 @@ export const authApi = {
       id_token: idToken,
       campaign_slug: campaignSlug || undefined,
       referral_code: referralCode || undefined,
+      yandex_cid: getYandexCid() || undefined,
     });
     return response.data;
   },
@@ -71,6 +75,7 @@ export const authApi = {
       password,
       campaign_slug: campaignSlug || undefined,
       referral_code: referralCode || undefined,
+      yandex_cid: getYandexCid() || undefined,
     });
     return response.data;
   },
@@ -87,6 +92,7 @@ export const authApi = {
     const response = await apiClient.post('/cabinet/auth/email/register', {
       email,
       password,
+      yandex_cid: getYandexCid() || undefined,
     });
     return response.data;
   },
@@ -101,7 +107,7 @@ export const authApi = {
   }): Promise<RegisterResponse> => {
     const response = await apiClient.post<RegisterResponse>(
       '/cabinet/auth/email/register/standalone',
-      data,
+      { ...data, yandex_cid: getYandexCid() || undefined },
     );
     return response.data;
   },
@@ -198,6 +204,7 @@ export const authApi = {
         device_id: deviceId || undefined,
         campaign_slug: campaignSlug || undefined,
         referral_code: referralCode || undefined,
+        yandex_cid: getYandexCid() || undefined,
       },
     );
     return response.data;