AB#287060 feat: add adact minigames support

[maksymba-opti]

Summary

Adds Adact mini games support to GamifyWidgetSDK so iOS apps can open embedded campaigns in a modal WKWebView, matching the Web / Android contract.

What's included

• initialize(widgetUrl:adactUrl:) — optional adactUrl from onboarding/retrieval (SDK does not map regions)
• API:
  • openAdactCampaign(from:params:)
  • closeAdactCampaign() / closeWidget()
  • buildAdactCampaignUrl(params:) / getAdactUrl()
• OpenAdactParams (campaignId, cid?, token?)
• Builds {adactUrl}/embedded/{campaignId}?cid=&customerIdToken=
• No loyalty READY→INIT handshake for Adact (identity via query params)
• Loyalty and Adact are independent surfaces; only one modal overlay at a time
• Bridge handles CLOSE (dict or JSON string) in addition to closeWidget
• Version bump to 6.9.0 (SDKVersion.swift + podspecs + CHANGELOG)
• Unit tests for URL building / initialize

Test plan

• initialize with adactUrl; openAdactCampaign presents modal WebView
• Loaded URL is /embedded/{campaignId} with optional cid / customerIdToken
• Missing adactUrl / campaignId / non-HTTPS → no-op (no crash)
• closeAdactCampaign() dismisses Adact only; closeWidget() dismisses loyalty only
• Opening Adact closes an open loyalty overlay (and the reverse)
• Unit tests: GamifyWidgetSDKTests pass