Fix Telegram NyxID binding prompts

[louis4li]

Summary

• Avoid duplicate Telegram OAuth links in the NyxID /init reply by keeping the URL only on the action button for Telegram.
• Render NyxID binding retry and callback success copy with the actual channel platform instead of hardcoded Lark wording.
• Add identity channel regression coverage for Telegram /init and callback HTML copy.

Test plan

• dotnet test test/Aevatar.GAgents.ChannelRuntime.Tests/Aevatar.GAgents.ChannelRuntime.Tests.csproj --nologo --no-restore --filter "FullyQualifiedName~Identity" --verbosity quiet -clp:ErrorsOnly
• bash tools/ci/test_stability_guards.sh
• git diff --check

🤖 Generated with Claude Code

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-08T07:45:53.094642Z	b4d29ed	PR opened

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: b4d29ed423

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.44%. Comparing base (e483895) to head (8d7cef3).
⚠️ Report is 1 commits behind head on feature/integrate.

@@                  Coverage Diff                  @@
##           feature/integrate    #3605      +/-   ##
=====================================================
- Coverage              83.44%   83.44%   -0.01%     
=====================================================
  Files                   1709     1709              
  Lines                 197728   197728              
  Branches               23735    23735              
=====================================================
- Hits                  165004   164998       -6     
- Misses                 21683    21691       +8     
+ Partials               11041    11039       -2     

Flag	Coverage Δ
ci	83.44% <ø> (-0.01%)	⬇️

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see 3 files with indirect coverage changes

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