From PR #2923 by @dotX12, with improvements:
- Support type: "external" as alias for "externalLink" in app config
- Extract urlScheme from subscriptionLink buttons in blocks[] when not at root
- Wrap custom URL schemes in HTTPS redirect for Telegram compatibility
- Fallback to plain subscription URL when no redirect template configured
Improvements over original PR:
- Also check btn.get('url') not just btn.get('link') for scheme extraction
- Validate extracted scheme contains :// before accepting
- Skip redundant redirect wrapping when create_deep_link already wrapped
Fringg
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