chore(triple): clean up draft TODOs and unify comment style

[lizining1231]

Description

Fixes #3598 (task 24)
Unify the comment style in the Triple mainline( protocol/triple/client.go , protocol/triple/server.go ,
protocol/triple/triple_protocol/handler.go ). This is a comment-only change with no behavior impact.

Changes

• Remove stale and duplicate draft TODOs: two dangling client TODOs
  (already implemented), a duplicated opentracing TODO, and a TODO
  referencing the non-existent handleService.
• Fix a malformed TODO: // todo:// open tracing -> // TODO: support OpenTracing.
• Rewrite the "Enrich http2/http3 transport config" TODOs into real transport config descriptions.
• Comment capitalization: capitalize the first letter of inline comments
  (including end-of-line comments) across the three files.
• TODO capitalization: normalize todo to all-caps TODO with a colon,
  keeping author tags (e.g. TODO(DMwangnima):).
• Term capitalization: idl -> IDL, tls -> TLS, opentracing -> OpenTracing.
• Comment formatting fixes: missing space after //,
  tailer -> trailer typo, and consistent Compatibility: notes.

Checklist

• I confirm the target branch is develop
• Code has passed local testing
• I have added tests that prove my fix is effective or that my feature works

[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.87%. Comparing base (48d6e69) to head (a89c3f2).
⚠️ Report is 8 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3607      +/-   ##
===========================================
- Coverage    54.57%   53.87%   -0.71%     
===========================================
  Files          460      474      +14     
  Lines        35443    36388     +945     
===========================================
+ Hits         19344    19604     +260     
- Misses       14543    15207     +664     
- Partials      1556     1577      +21     

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[lizining1231]

All CI failures are "Set up job" errors due to the recent GitHub Actions outage, unrelated to this PR. Could someone please re-run the workflows? Thanks!

[Alanxtl]

lgtm