feat(mqtt): Enhance EMQX API integration with active client tracking

[jbouse]

Improve integration with the EMQX API by adding functionality to track active client connections based on username. Update documentation and embed responses to include active connection details when configured.

[mergify]

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• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?:

[eric-becker]

!deadbeef approved

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-04-29 17:34 UTC · Rule: default
• ✅ Checks passed · on draft merge queue: embarking main (e96e69e) and #38 together #39
• ✅ Merged — 2026-04-29 17:35 UTC · at 4c0aa007ff2234d170c04cbd6d92eab7435756f3

This pull request spent 1 minute 28 seconds in the queue, including 1 minute 8 seconds running CI.

Required conditions to merge

• #approved-reviews-by >= 1 [🛡 GitHub repository ruleset rule Only allow Mergify and Admin Team to update default branch]
  • feat(mqtt): Enhance EMQX API integration with active client tracking #38
• #changes-requested-reviews-by = 0 [🛡 GitHub repository ruleset rule Only allow Mergify and Admin Team to update default branch]
  • feat(mqtt): Enhance EMQX API integration with active client tracking #38
• #review-threads-unresolved = 0 [🛡 GitHub repository ruleset rule Only allow Mergify and Admin Team to update default branch]
  • feat(mqtt): Enhance EMQX API integration with active client tracking #38
• branch-protection-review-decision = APPROVED [🛡 GitHub repository ruleset rule Only allow Mergify and Admin Team to update default branch]
  • feat(mqtt): Enhance EMQX API integration with active client tracking #38
• all of [🛡 Merge Protections rule Do not merge outdated PRs]:
  • #commits-behind <= 10
    • feat(mqtt): Enhance EMQX API integration with active client tracking #38
• all of [🛡 Merge Protections rule Enforce conventional commit]:
  • title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?:
    • feat(mqtt): Enhance EMQX API integration with active client tracking #38
• any of [🛡 GitHub repository ruleset rule Only allow Mergify and Admin Team to update default branch]:
  • check-neutral = CodeQL
  • check-skipped = CodeQL
  • check-success = CodeQL
• any of [🛡 GitHub repository ruleset rule Only allow Mergify and Admin Team to update default branch]:
  • check-neutral = Mergify Merge Protections
  • check-skipped = Mergify Merge Protections
  • check-success = Mergify Merge Protections