feat: hiden auto_subscribe conf

[zhongwencool]

Fixes EMQX-9505

Hide the auto_subscribe in configuration file, so that it can be modified only through the HTTP API.

Summary

🤖 Generated by Copilot at a70930f

The pull request hides the auto_subscribe configuration fields from the default view and updates the version of the emqx_auto_subscribe application. This improves the user experience and maintains the version consistency.

PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• Added tests for the changes
• Changed lines covered in coverage report
• Change log has been added to changes/{ce,ee}/(feat|perf|fix)-<PR-id>.en.md files
• For internal contributor: there is a jira ticket to track this change
• If there should be document changes, a PR to emqx-docs.git is sent, or a jira ticket is created to follow up
• Schema changes are backward compatible

Checklist for CI (.github/workflows) changes

• If changed package build workflow, pass this action (manual trigger)
• Change log has been added to changes/ dir for user-facing artifacts update

[coveralls]

Pull Request Test Coverage Report for Build 4685050591

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 42 unchanged lines in 16 files lost coverage.
• Overall coverage decreased (-0.04%) to 81.116%

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Files with Coverage Reduction	New Missed Lines	%
apps/emqx_bridge/src/emqx_bridge.erl	1	91.2%
apps/emqx_modules/src/emqx_delayed.erl	1	94.78%
apps/emqx/src/emqx_broker.erl	1	88.2%
apps/emqx/src/emqx_flapping.erl	1	85.11%
apps/emqx/src/emqx_listeners.erl	1	87.18%
apps/emqx/src/emqx_message.erl	1	94.83%
apps/emqx/src/emqx_session.erl	1	87.65%
apps/emqx/src/emqx_stats.erl	1	93.33%
apps/emqx/src/emqx_sys_mon.erl	1	91.67%
apps/emqx/src/emqx_cm.erl	2	91.44%

Totals
Change from base Build 4680037970:	-0.04%
Covered Lines:	25314
Relevant Lines:	31207

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💛 - Coveralls

[HJianBo]

LGTM